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

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.

Answer 1

[Srh Fwl]

Figured it out.

xref = 10.^(-1:.1:3);
yref = xref
plot(xref,yref)