axis ([0 8 0 3]) in matlab

You can use the axis function in MATLAB to set the limits of the axes on a plot. If you want to set the limits of the x-axis to be [0, 8] and the y-axis to be [0, 3], you can write the following code:

main.m
axis([0 8 0 3])
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This will set the limits of the current plot to be [0, 8] on the x-axis and [0, 3] on the y-axis.