Inserting the Calculated Number on Figure

Hey,

My code plots matrix Y with respect to matrix X and it calculates max(Y). I want to:

(i) Determine the number in [X] corresponding to (max(Y)), and (ii) Display both of these numbers on the plot. (Something like: "The Peak of the curve is 200 at 660)

where 200 is the peak of the plotted curve at x=600.

Any kind of help in this regard will be greatly appreciated.

Thanks!

Answer 1

[Walter Roberson]

[maxy maxyidx] = max(Y);
x_at_max = X( subs2indx(size(X), 1:size(X,1), maxyidx) );

Your (ii) is written as if there is only a single value resulting from max(Y), but max(Y) is going to give you a maximum for every column, as you indicate that Y is a matrix.

[manish sharma]

Certainly, my mistake. Actually, for our case, X and Y are column vectors of size 2048 X 1.

[Walter Roberson]

[maxy maxyidx] = max(Y);
x_at_max = X(maxyidx);
title( sprintf('The Peak of the curve is %f at x=%f', maxy, x_at_max));

[manish sharma]

Brilliant, that worked Walter. Thanks for your help.