Adding octave example

octave/.gitignore

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+**/.DS_Store

octave/Dockerfile

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+FROM matpower/octave:latest@sha256:5d1683c81873c56a37774bc7c42ef3d78a7e107781e974a1b8957073bac4436a
+
+ARG OCTAVE_VERSION="9.2.0"
+ARG OCTAVE_IMAGE_REVISION="1"
+
+RUN mkdir /safe_data /safe_outputs /scratch /test
+
+WORKDIR /test
+
+COPY --chmod=0755 src/* .
+
+CMD ["/bin/bash", "run_octave.sh"]

octave/README.md

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+# TRE Octave example
+
+## Running
+
+Run with standard `ces-run` command. 
+
+## Notes
+
+In this example, a bash script uses an octave script to generate a plot and then saves the `.png` output to `/safe_outputs`. Both files are found under the `src` directory, which is copied inside the container in the `Dockerfile`. 
+
+This example is not interactive.

octave/src/plot_example.m

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+% declaring variable var_x
+var_x = [0:0.01:1];
+
+% declaring variable var_y1
+var_y1 = sin(4 * pi * var_x);
+
+% declaring variable var_y2
+var_y2 = cos(3 * pi * var_x);
+
+% plot var_x with var_y1
+plot(var_x, var_y1);
+
+% hold the above plot or figure
+hold on;
+
+% plot var with var_y2 with red color
+plot(var_x, var_y2, 'r');
+
+% adding label to the x-axis
+xlabel('time');
+
+% adding label to the y-axis
+ylabel('value');
+
+% adding title for the plot
+title('my first plot');
+
+% add legends for these 2 curves
+legend('sin', 'cos');
+
+print -dpng 'plot.png'

octave/src/run_octave.sh

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+#!/bin/bash
+
+octave plot_example.m
+
+mv *.png /safe_outputs