Timothy A. Gonsalves, Professor Emeritus, IIT Mandi


IIT Mandi Campus If you are in IIT Mandi, click here for a much larger collection of tutorials, slideshows, etc.

Female rhesus macaque monkey Click here for my Quality Images and assorted photos shared on Wikimedia Commons


Aids for Programmers

How to study Preface from a textbook on programming
GNU Emacs tutorial
Linux tutorial
Gdb tutorial
A Standard for C Code
Code review guidelines for the DONlab coding style
The CVS source code version control
Guide to understanding large open-source applications
Brief intro to Java for C/C++ programmers
A Standard for Java Code
Template for specifications of a Mini-Project Intended for software design and implementation mini-projects of a few weeks duration.
Template for a Major Technical Project (MTP) proposal Intended for software design and implementation projects, could be adapted for other types of projects.
Template for the design document of a software project.
Sample performance report. Use for reporting performance measurements done by experiments on real systems or simulation.
Confidence Intervals: A brief tutorial on why and how to compute confidence intervals in experimental measurements.

Perl for the Lazy Programmer A quick guide to some of Perl's most useful features. (Best viewed with OpenOffice 4.x. LibreOffice 5.x also works.)


CSE Course Materials

An overview of Linux Network Device Drivers (pdf) with audio accompaniment (mp3).

Photography docs, videos and image galleries

Notes on sensor dust and how to deal with it.

Movie Making & Editing: Notes on assorted techniques for making and manipulating simple videos, mostly using ffmpeg

Monsoon videos and photos: Last updated 28 Aug 2020

Dogs and Monkeys

Video of a family of rhesus macaque monkeys playing in the tree opposite our balcony at C20-G2. Speedy, a small black dog who is a good hunter, waited unobtrusively near the tree in hopes of catching a tender young monkey. To her chagrin, Rusty our Irish setter gave the game away by expressing his displeasure noisily from the balcony.
Recorded with a Sony RX100M6 in 4K, trimmed and spliced in Blender, downsampled to 800x450 and 15 fps using ffmpeg.
The title image of two adult females and a baby was taken by me with a Nikon D7200 + 200-500mm telephoto lens, and edited by Kartiki Gonsalves.

A travelogue of our trip to the Spiti Valley Himachal Pradesh, 16th to 24th June 2018.

A travelogue of our trip to the Keylong area of Lahaul, Himachal Pradesh, 15th to 21st July 2016.

Kartiki Gonsalves Photography and Kartiki on Instagram have stunning images of people, landscapes, travel and wildlife.

First snowfall on IIT Mandi campus in 25-30 years! Pics: 7th Feb night and 8th Feb morning 2019. More pics here

Slow motion video of falling water drops

Taken with a Sony RX100M6 using High Frame Rate video mode. Shot at 1,000 fps and saved at 25 fps, ie 40x slower than real-time. The RX100M6 has a 20 MP EXMOR-RS sensor, the same type used in the high-end pro Sony A9 full-frame camera. Normal sensors have a grid of wires on top of the sensor for reading the data from the pixels. This reduces the light falling on the pixels by about 30%. Data is readout serially on the grid which limits the number of frames per second. The EXMOR-RS sensor has the read wires and circuitry stacked directly under the sensor, resulting in better low-light performance and very high speed parallel readout of the image.
Parmod Kumar, Assistant Professor in the School of Engineering, used OpenFOAM to simulate a drop falling through air on a liquid surface. The simulation is remarkably similar to the real-life video.
Sony RX100M6 HFR Video OpenFOAM Simulation, by Parmod Kumar

Speeches

No DateTitleEvent Remarks
8 Tue 20 Oct 2020 The Rise of (Applied) AI CSE Dept, Vignan University, Guntur Distt, AP Traces the development of AI since 1950. Covers some fundamental laws and technologies that have supported the recent rise of AI and data science. Describes some AI-based applied projects at IIT Mandi and related curricula innovations.
Invited speech, delivered from Kamand via the Internet
7 30 July 2020 Creating an IIT in a Remote Greenfield 5th Foundation Day, IIT Goa Chief Guest speech, delivered from Kamand via the Internet
6 30 June 2020 Farewell speech Function arranged by faculty+staff of IIT Mandi in the Village Square Farewell speech on completion of my term as founding Director of IIT Mandi, 15/Jan/2010 - 30/Jun/2020
5 30 May 2020 Challenges in Creating a Global Institute in a Remote Location
Webinar hosted by IITACB "Temples of Learning -- Ancient India: on the banks of a Himalayan river; under a banyan tree. Modern India: in crowded, polluted, COVID-infested cities. Can this change?" I trace the genesis of IIT Mandi, and some of the strategies that have led to its successes over its first decade. We have laid firm foundations for scaling ever greater heights during its coming 2nd decade.
View slides only: Challenges in Creating a Global Institute in a Remote Location
4 Apr 2020 Musings on Change: Driver for SDN CSI Transactions on ICT, 2020 Keynote speech at ICSDN, Anna Univ., 9/8/19
Examines change from antiquity to the present, and extrapolates to the future. Shows that we are in an age of exponentially-increasing rate of change. Motivates the need for a flexible architecture for the Internet. Lists challenges of using software-defined networks (SDN) as the base.
The first part of the talk is general: history of technology and Internet technology. These sections will be interesting to many. If you are interested in computer networks, read through to the end!
3 Tue 10/3/20 My Path to Setting up an NGO for Women in Rural India Women's Day, IIT Mandi Speech by Priscilla Gonsalves: From US in 1950s to EWOK in Kamand in 2016 via Yugoslavia and Afghanistan. Includes photos of Afghanistan in 1972-74.
Last updated: 11:30 am 3/5/2020.
EWOK website, EWOK on Wikipedia
2 Mon 2/1/17 IIT Mandi: Scaling the Heights Ruby Reunion, BTech 1976
1 Mon 1/8/16 Director's Welcome BTech Orientation 2016

Treks

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5 Birding around Sirudavoor Lake, 10 Jan 2021 Slideshow of 52 best images (5.0MB) Download 52 selected images individually

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Drove about 30 km south-south-west from Uthandi to Sirudavoor Lake. Joined en route by Ambareen and Ram at Kelambakkam. Started walking at 7 am. A cool morning, partly overcast. Besides birds, the only life was young villagers speeding along the road on their 2-wheelers. After an hour of walking along the lake, we went into Tuscani resort and spent an hour there. It has a large area of paddy fields with a few plots yet to be developed. Many birds in the fields. Stopped at Sangeetha ECR for dosai and coffee on the way back. Quite popular on a Sunday morning, a result of the steady abatement of COVID.
Pictures by TAG, except one picture of TAG by Ram.
4 Birding along Siruvadoor Lake, south of Chennai, Sun 27th Dec 2020 Slideshow of 33 best images (4.6MB) Download 33 selected images individually

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Drove about 30 km south-south-west from Uthandi to Sirudavoor Lake. Enakshi and friends joined from IIT Madras (about 1h10m drive for them). After driving around in circles for half an hour we found the lake. The sun was high in the sky and the air a bit hazy. We saw a collection of water birds.
In anticipation of good birding, I had loaded my 200-500 mm lens, tripod and monopod in the car. At the lake, I found that I had forgotten the camera body to go with the lens! Being absent-minded is good for one's reputation as a professor, but not good for memorable bird images! :-) Enakski kindly loaned me her Nikon P600, a vintage long zoom compact camera that takes decent images.
The locality is peaceful albeit without much shade from the sun. Besides birds, the only life was young villagers speeding along the road on their 2-wheelers. After an hour of birding, we enjoyed fresh coffee and Christmas cake in the shade of some trees before the drive home.
Pictures by Enakski and TAG.
3 Hike along the last few km to Lake Prashar, 8 Aug 20 Slideshow of 32 best images (3.8MB) Download 32 selected images individually

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Drove in the WagonR from IIT Mandi up to 4 km short of Lake Prashar with Rik, Subrata and Rishu, about 1h15m. Started walking at 8,500', initially a steady climb through stately deodars. After 1 km, the forest gave way to the open meadow leading to Lake Prashar. After the recent rains, the grass was a lush green, with numerous small streams flowing down the hillside.
As sunshine gave way to mist, we turned back and off the road in a narrow pass through to the Kullu side. Past a Gaddi herder's hut and came upon a serene albeit muddy pond. We sat and enjoyed the view with snacks and steaming coffee from a flask.
Returned to the car after a hike of about 6 km in 2.5 hours. The drive back to Salgi took 1h15m.
D72_* and R16_* by TAG, others by Rik Koner.
2 Hike from Arnehar to Kuthachi and beyond, 1st Feb 2020 Slideshow of 46 best images (5.0MB) Download 55 selected images individually

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Departed from Raman GH at 8:20 am. Drove to 1/2 km before Arnehar, 5,000' altitude (about 2,000' above North Campus). Walked along a new dirt road through pine forests to Kuthachi Village. Thereafter, the road descends gradually into a valley behind Kani Top. Back to North Campus at 12:40 pm.
The hike was led by Anoushka, MS student in SCEE.
Photo credits:
D72_* by TAG with a Nikon D7200.
R16_* by Debashrita with a Sony RX100M6.
1 Morning walk near Arnehar, 26th May 2019 Slideshow of 37 best images (4.9MB) Download 37 selected images individually

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Drove from North Campus to 1 km before Arnehar at 6:45 am. Walked beyond Arnehar through forest of pine, khaphal and rhododendron. Warm and clear with crisp clear views of Salgi, Griffon peak and the mountains up to the snow-capped Dhauladhars. With Aditi + Viswanath, Saurabh + Pooja Lodha, Neha Kaushik, and families.

Events

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1 Shweta Rao Garg "Journey of a Woman Artist", 13th March 2020 Slideshow of 15 best images (1.4MB) Download 15 selected images individually

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SHSS Seminar, organised by Nilamber Chhetri, CV Raman Guest House Conference Room.
Photos by TAG with a Sony RX100M6

Social

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3 Views of our house in Uthandi, Dec 2019 - Jan 2021 Slideshow of 16 best images (1.8MB) Download 16 selected images individually

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In 2019, we rented a house in Uthandi, a suburb on the southern outskirts of Chennai. We shifted here in December 2020. The 2-story house has a small garden, covered parking and two terraces on the upper floor. The slideshow has pictures of the beach near our house, 1st Main Road leading to the beach, the entrance to the house and various rooms.
Pictures by TAG & Sree
2 Faculty-Staff Picnic, Rewalsar, 16th Feb 2019 Slideshow of 84 best images (11MB) Download 134 selected images individually

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Departure from North campus 9:30 am, return 6:45 pm. Clear, cool, sunny day with glorious views of the pine-covered mountain slopes. Assorted activities depending on interest including visits to Naina Devi temple, Rewalsar Monastery, walking around the Rewalsar Lake, etc. Morning snack at Hotel Mid-Way, halfway up to Naina Devi, and lunch at Hotel Tourist, HPTDC, Rewalsar.
Thanks to Prosenjit Mondal assisted by Pavin Samuel, Sandhya, PTG and others, for the impeccable arrangements.
Pics D72_9726 .. D72_9737 by Pavin Samuel.
1 Gourmet Club: German dinner by Balthasar Novak, 25 May 2018 Slideshow of 71 best images (7.4MB) Download 87 selected images individually

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Misc

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13 Gemur/Darcha/Yoche, Lahaul, Sun 11th Oct 2020 (1 of 4) Slideshow of 56 best images (7.6MB) Download 56 selected images individually

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After a breakfast of aloo parantha, we set off for a gentle walk to acclimatise on this first day above 10,000'. Down to the jhulla across the Bhaga, about 08:45 am. On the left bank we climbed over rock piles and thorny shrubs to an open grassy slope on the left bank of a stream up to a waterfall. Had snack and enjoyed the view before returning. Reached about 12:45 pm.
The area is much drier with browns, yellows and splashes of red and purple compared to the earlier visit in July 2016. Seabuckthorn has dry leaves and copious yellow/orange berries that have a sharp astringent taste. Wild roses with bright red rose hips (fruit). Aromatic sage plentiful, brown grass and stunted juniper on the slopes. Flushed about 10 snow partridges in the rocky slopes opposite Gemur.
In the afternoon, at 3 pm we drove to New-Darcha. Walked along the spur road up a river about 5 km to the last village Yoche. Vast scree slopes from the road to about 1,000-2,000'. Peaks about 4,000' above us with small ice-fields. At the end of the valley is the snow-capped M10, 5,840m (19,160'). Extensive cultivation on the riverbed. Potatoes being loaded into lorries. Bright yellow paper birch or aspen (?) on the slope provide relief from the dark, stark rocks and green junipers. Met two oxen, two cars and the Keylong-Yoche bus.
The peaks around Gemur and Darcha are mostly barren except for a few icefields near the summits and some small glaciers. Above the valley floor at 10,500', there are stunted junipers and a few birch/aspens up to 12,00'. The 5,700m (18,700') peak south of Gemur towards Sissu has a large cover of ice and snow that catches the sun's rays about 6:30-7:30 am.
12 Jankar Nala & Jispa, Lahaul, Mon 12th Oct 2020 (2 of 4) Slideshow of 62 best images (8.3MB) Download 62 selected images individually

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In the morning, we drove past Darcha and onto the new road up the Jankar Nala valley toward Zanskar. The broad new 2-lane road is a far cry from the narrow single lane road that we took 4 years ago. The road climbed steadily from a barren valley with ranges towering to 16,000'-20,000' on either side, scree slopes of 1,000' and only a few beds of plants, dark red with approaching winter.
After the helipad at Zanskar Sumdo (11 km from Darcha), the road turned into rubble and dust. The going was slow with crews at work. By about noon we had reached 14,000 near Ramjak, 9 km from Sumdo and still 10 km short of the Shinku La. We stopped in a level area and walked down to the river. Walked upstream with views of the rounded snow-capped Shinku Ri peak, looks like Mt. Kailash. A stark contrast to the rugged mountain slopes. There was ice in shallow pools in the Jankar Nala.
Returned with several halts en route to enjoy the rugged scenery. Stopped at Paldun Lamo where the river flows through the narrow cleft in the road about 100' deep and 40-50' wide. A Buddhist shrine has been developed. Reached Gemoor Khar about 03:30 pm for a late lunch.
In the evening, we tried to cross the Bhaga at the Gemur campsite. A farmer was working in the fields opposite and had tied the jhulla on the far bank. Loath to disturb him, we drove to Jispa and walked upstream along the river for 2 kms. A mix of cratered walls, camp sites, seabuckthorn, potato fields and the sandy river bed. Near Jispa, the river bed broadens and the river becomes braided. Returned to Jispa on the road.
From Thenu to Gemur to Jispa, the left bank of the Bhaga varies up to 200-300m wide, good for walking, mostly rocky scrub with a few fields. In one place between Gemur and Jispa and near Jispa, the scree comes down to the river. Perilous paths are visible. Except for Thenu which is on the left bank, all other habitation is on the right bank.
11 Hike to Gemur glacier west & Khangsar to Gemur Monastery, Lahaul, Tue 13th Oct 2020 (3 of 4) Slideshow of 60 best images (8.5MB) Download 60 selected images individually

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Clear, cool weather continued. We crossed the Gemur jhulla at 9 am and led by Manager Rajkumar, we headed downstream toward a glacier at the top of the steep side valley about 1.5 km west of Gemur. Without a path, we traversed scree slopes of varying gradients. Some sections had 10-15’ junipers, others had grass, in places there was no vegetation only treacherous sharp broken stones.
Climbing slowly upwards, we reached about 300' above the river with a view of the glacier at 11:30 am. Rajkumar returned to Gemoor Khar. I stayed at the “base camp” taking photographs. Sree, Shyamlal and Jhaa headed towards the glacier. In an hour they progressed about 300'. Jhaa stopped at one big boulder, Sree and Shyamlal went to a bigger boulder ~50-100' higher. We returned to Gemur by a path lower down along the river, for another 3:30 pm lunch.
In the evening, we drove to Khangsar about 1,000’ above Gemur. En route, we stopped to look down on picturesque Thenu village on the left bank of the Bhaga. Comparing it with pictures from July 2016, it was lush green then and dry brown after potato harvest now. A detailed comparison of the buildings indicated no new construction in 4.5 years, not even addition of a floor or rooms to an existing house. Perhaps due to a stable population and being off the tourist route. The Khangsar monastery was closed. We walked down the dirt road to Gemur Ghompa (monastery). Good views of the Bhaga upstream to Darcha. The setting sun threw the mountains beyond Darcha into warm relief. At the Ghompa, the caretaker opened it for us and gave us a tour of the whole building.
It was getting dark as we returned to Gemoor Khar. To avoid the cemented path to Gemur, we clambered down a steep path above and on the far side of Gemoor Khar, by the light of one cellphone for 3 of us. Not recommended, though we made it back without any mishaps!
10 Drive from Gemur to Sissu to Rohtang Pass to IIT Mandi, Wed 14th Oct 2020. (4 of 4) Slideshow of 22 best images (2.9MB) Download 22 selected images individually

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Departed from Gemur at 8:45 am. Light traffic to Sissu. Golden aspens or birch lining the road at Sissu. Drove up to Ghepan Monastery above Sissu. It was under renovation so we could not visit. Continued on past the Rohtang Tunnel to Koksar and up to Rohtang Pass. With light traffic, we reached about noon. Very few tourist vehicles at the Pass. We spent an hour walking across from Lahaul side to Beas Kund on the Kullu side. Stopped at Marhi for a late lunch.
In Manali, we stocked up on exotic provisions at the Mall, and enjoyed coffee and fresh “German” cakes at Amigos Bakery. The drive back to Salgi was uneventful, with a stop to pick up fresh fruit outside Kullu. Reached home at 7:45 pm.
9 Barot, Fri-Sun 23rd-25th Oct 2020 Slideshow of 67 best images (8.7MB) Download 67 selected images individually

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Priscilla and I drove to Barot in the WagonR on Friday afternoon, via Dyna Park. About 2h50m owing to road work. Stayed in the PWD Resthouse. Walked up the Uhl for 2 km before it got dark.
On Saturday morning, we drove up the Uhl to Baragram. Walked 2-3 km almost to the end of the road. Returned for a late lunch of veg momos (mostly cabbage) and grilled trout. In the evening, Rik, Subrata and Rishu arrived. We walked along the Lamba Dug.
On Sunday morning, we again drove up the Uhl part way. Walked up the road with an excursion along a side stream. After lunch, drove back home, stopping near Dyna Park to enjoy the sunset.
8 Visit to Manali, 2nd-6th Sep 2020 Slideshow of 54 best images (6.9MB) Download 54 selected images individually

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Stayed with Sarojini and Ashok Thakur in their house in an apple orchard in Sirsa, 2 km before Manali. Enjoyed walks in the orchard and the mountains behind it. Drove to Manali Mall Road and Solang Valley.
Drive from Salgi to Manali took 2h50m. On the return, we drove along the left bank road up to Kullu. Mostly a good 2-lane road, potholes here and there. Reached Bajaura in 2 hours. Due to a landslide near Aut, there was heavy traffic on the Kandi road, and the drive from Bajaura to Salgi took 3.5 hours.
7 Parakeet enjoying sunflower seeds, 10 Jun 20 Slideshow of 16 best images (2.3MB) Download 16 selected images individually

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On June 6th, Portia and Naveksha photographed glorious sunflower blossoms outside C-10. On June 10th, as the flowers matured and the seeds ripened, a male plum-headed parakeet enjoyed breakfast of dozens of sunflower seeds. In about 10 minutes, he denuded one of the mature flowers. Then, he flew up into a nearby tree, and told his female friend about it. She spent a couple of minutes before leaving. Other insects also enjoyed the flowers, without damaging them.
Parakeet images: D7200 with Nikkor 200-500mm
6 Birds in IIT Mandi Campus at Salgi, March-April 2020 Slideshow of 26 best images (2.8MB) Download 26 selected images individually

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Birds do not suffer from COVID-19 and are free from lockdown! Most of these photos were taken from our living room, while the birds were foraging for fruit and insects in the trees outside our house. Mostly with a Nikkor 200-500mm lens, a few with a Nikkor 18-300mm.
5 Bird-watching at Pong Reservoir, Nagrota Suriyan, and visit to Masroor Rock Temple, 25-26 Jan 2020 Slideshow of 56 best images (5.0MB) Download 56 selected images individually

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On Sat 25th Jan, we drove from IIT Mandi to Nagrota Suriyan on the bank of the Pong Reservoir. Stayed in the PWD Resthouse with a good view of the river and the distant Dhauladhars. Spent the evening on a large mud flat beside the reservoir. Large numbers of bar-headed geese, many waders and water birds, a few songbirds and raptors.
On Sun 26th, after an early morning walk through the town, we drove to the nearby Masroor Rock Temple, carved out of solid sandstone. Reminiscent of the rock-cut temples at Mahabalipuram south of Chennai. Dating from 8th century AD. Partly in ruins due to the Kangra earthquake.
Photo credits: Nikon D7200 - Neha Sharma, Dikshita Nath, TAG; Canon EOS500D - Dikshita, TAG; Sony RX100M6 - TAG
4 Visit to Corbett Tiger Reserve, Uttarakhand, 2nd-5th December 2019 Slideshow of 58 best images (6.9MB) Download 58 selected images individually

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As a boy in Ooty, I grew up on Jim Corbett’s tales of hunting man-eating tigers and leopards. “Man-eaters of Kumaon” was my favourite. In the mountains of the Nilgiris, clad in grass, eucalyptus, cypress and wattle, I imagined vivid mental pictures of the foothills of the Himalayas in which Corbett lived. In early December, I visited the Jim Corbett National Park to see Corbett country in person. The trip was very graciously arranged by Deepti (my MS student from IIT Madras) and Mayank and their delightful daughters, Meera and Vrinda.
On the first evening, we spotted 6 tigers at close quarters, and one more on the next day. Other animals included elephants, cheetal, barking deer, sambhar, monkeys and wild boar. Birds were aplenty along the Ramganga River – eagles, a lammergeier, herons, storks, egrets, kingfishers, redstarts, barbets, bulbuls, etc. We spent many hours sitting peacefully in the grasslands or in the sal forest, soaking in the sounds of the birds, the wind sighing through the sal trees, alarm calls of monkeys and deer, and the occasional growl of a tiger and trumpeting of an elephant. Our guide/driver Imran was very knowledgeable and adept at spotting animals and birds.
Most pics by T.A. Gonsalves, a few (C) pics by Kartiki Gonsalves http://www.kartikigonsalves.com/
3 Snow in IIT Mandi Campus -- Salgi and Kamand. 7-8th Feb 2019 Slideshow of 46 best images (5.5MB) Download 46 selected images individually

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Heavy rain on Thursday 7th evening changed to snow as temperatures dropped. Friday morning dawned crisp and clear, with the campus covered with 1-2 inches of snow. By noon most of the snow on campus had melted, though the snow on north facing mountain slopes lasted for 2-3 days. The last time it snowed on campus was in December 2014 (the snow did not persist). The last time the campus was covered with snow is said to be in 1992.
Pics by TAG, Neha Sharma and Merlin Sundar
2 Better Half cricket, 11/3/17
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1 Ruby Reunion, BTech 1976, 2/1/17 at IIT Madras and 3-4/1/17 at Radisson Hotel, Mahabalipuram
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Most images by TAG, DSC00052.jpg -- DSC00055.jpg by PTG


Assorted Information

Choice of Public Lighting for Healthy Living. Artificial lighting enables activities and safety, but may adversely affect health. June 2020

A Quick Guide for Aspiring Wikipedia Editors

Female Increase in IIT BTech -- Highlights of the 12th Apr 2017 report of the JAB Sub-Committee.

Sustainable Energy by David Mackay -- An excellent data-driven analysis of energy usage now and in the future. A must read for anyone interested in our energy use and its impact on the environment. Very readable presentation.

Fellow IETE 26 July 2020

My contributions to Wikipedia and other Wikimedia projectsOriental White-eye Windermere Ooty D72 5232


Contact Information

	Timothy A. Gonsalves			
Professor Emeritus (Hon)
Founding Director (1/2010-6/2020)
Indian Institute of Technology Mandi
Kamand - 175 075, District Mandi, Himachal Pradesh,
+91-94180-47732  tag@iitmandi.ac.

3/142, Plot 9, 1st Main Rd., VGP Layout,
Uthandi, Chennai - 600119, Tamilnadu, India
Click for location
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Permanent Residence:
    Windermere, 23 Ethiraj Road       
    Ooty - 643 001
    The Nilgiris, Tamilnadu, India
My home pages at IIT Madras and at IIT Mandi.
Edited: 8 Sep 2020