Vismatrix is a nice tool to visualize sparse matrices in (.smat) format

sudo apt install libgl1-mesa-dev libglut-dev
bash all.bash

To Professor David Gleich for this wonderful tool.

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vismatrix 2.0 
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Copyright David Gleich, Leonid Zhukov, 2006-2007.

Unless otherwise noted, the source files are distributed under the BSD-style license found in the LICENSE file.

See also LICENSE files in each one of the subdirectories boost, glui, and tclap.

1 Install dependencies (tested on Ubuntu 23.04 LTS):

sudo apt-get install freeglut3-dev libxmu-dev libxi-dev libz-dev g++ make cmake

2 Download the code into /tmp/vismatrix:

git clone --depth 1 https://github.com/cpmech/vismatrix.git /tmp/vismatrix

3 Compile the code (in /tmp/build-vismatrix):

./all.bash

4 The executable file will be /tmp/build-vismatrix and you may install into /usr/local/bin by using:

sudo cp /tmp/build-vismatrix/vismatrix /usr/local/bin/

The matrix input file is quite simple (0-index based):

m n nnz
i j x
...
i j x

where the first line has m as the number of rows, n as the number of columns, and nnz as the number of non-zero values. The following lines contain the index of row i and column j of the non-zero entry x.

See example.smat file.

Usage:

vismatrix example.smat

Some commands:

• right-click to Exit
• mouse move: pan
• shift + mouse: zoom
• control + click: inspect value
• right-click: options