Matlab plot a threshold line

Question

I want to add a horizontal threshold line to my graph of 0.7. But I can't seem to get it to work.

Code

figure(1)
plot(Variance);
hold on;
plot([1 frames], threshold, 'red')

Variance is an array to be plotted and the frames are the number of variances that are plotted. I've tried moving the hold and plots around but it doesn't seem to work either.

I know this is an easy question, but everything I've looked at online doesn't seem to work either, with regards to adding them to the same plot() .

Thanks

Answer 1

您应该将第二个绘图线更改为

plot([1 frames], [threshold threshold], 'red');