How can I plot a reference line of slope 1 on a loglog plot?

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Srh Fwl
Srh Fwl 2021-5-26
编辑： Srh Fwl 2021-5-26
I am not an experienced Matlab user and would appreciate advice on adding diagonal reference lines to loglog plots. I.e., the lines need to have a slope of 1 when plotted.
According to this post (https://matplotlib.org/stable/api/_as_gen/matplotlib.axes.Axes.axline.html), one way to do it is:
>>> axline((0, 0), (1, 1), linewidth=4, color='r')
However, this doesn't work for me. I get the error below (even though I followed the examples provided precisely and don't have mismatched delimiters). Can anyone please suggest an alternative method?
Invalid expression. When calling a function or indexing a variable, use parentheses. Otherwise, check for mismatched delimiters.

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Srh Fwl
Srh Fwl 2021-5-26
Figured it out.
xref = 10.^(-1:.1:3);
yref = xref
plot(xref,yref)

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