How do I get the x y coordinates from an index?

If I have a matrix

A =[0.1 0.2 0.3 
    0.4 0.5 0.6 
    0.7 0.8 0.9];

And i have index 4, how do I get the x and y values for index 4.

In this case I want to get x = 2 y =1.

Answer 1

[Star Strider]

My best guess as to what you want —

A =[0.1 0.2 0.3 
    0.4 0.5 0.6 
    0.7 0.8 0.9];

index = 4;

[r,c] = ind2sub(size(A),index)

r = 1

c = 2

See the documentation on ind2sub for details.

.

[Et d J]

That's it thanks a million!

[Star Strider]

As always, my pleasure!