How to find the position index of vector array

Hi,

I have meshgrid on X1 and and Y1 but I have attached only the X1 and x1 and y1 files

l=6.6667e-6, l is a line that divides the X1 grid into 2 equal part.

I have been able to plot this using the code below, which exactly what I wanted.

A = (X! >= -l/2 & X <= l/2);

imagesc(x, y, A)

Please, how can find position of -l/2 and l/2 ?

[Matt J]

I have been able to plot this using the code below

Please demonstrate what your code is doing, as you have seen others do with the forum's Run tool.

[University]

Hi Matt,

Using the data I have attached. I have been able to plot the data below:

A = (X1 >= -l/2 & X1 <= l/2);

imagesc(x, y, A)

hold on

plot([-l/2 l/2],[-1e-6 -1e-6],'r-', LineWidth=2)

xlabel('x')

ylabel('y')

In the attached plot. I have red line at the top of the figure. My question is how can I find index poistion of the starting and the ending point of the line. I.e., index position of -l/2 and l/2, l=6.6667e-6.

[Matt J]

openfig fig

ans = 
  Figure (1) with properties:

      Number: 1
        Name: ''
       Color: [1 1 1]
    Position: [360 97.6667 560 420]
       Units: 'pixels'

  Use GET to show all properties

Answer 1

[Matt J]

start=find(A(1,:),1,'first');
stop=find(A(1,:),1,'last');

[University]

Great, thank you Matt. You have been so helpful.