max co-ord on graph

I have a 2D line graph (X and Y). X is a variable, Y has no variable assigned. I just want to show the co-ordinates of the peak as I am trying to show that it will peak when Y = 1.

How?

Thanks

[the cyclist]

You have no Y data. What is it that is going to peak when Y=1?

Please add some details. You have not described your problem clearly enough (at least not for me to understand it).

Answer 1

[Thorsten]

 [Y_peak ind] = max(Y)
 X_peak = X(ind);
 disp(['Function peaks at X = ' num2str(X_peak) ...
       ' with value ' num2str(y_peak) '.'])

[Krystina]

error no Y defined?

[Thorsten]

How can you say "I have a 2D line graph (X and Y)." when Y is undefined? Either you need to define Y or to rephrase your question.