How do I find and assign the x and y values of a point from an index array based on the value of z?

Hello,

I am using an extracted column for finding a specific point.

V=F1(:,1); %F1 is the data of a matrix

When I display the data, the x, y, and z values are shown on a figure on coordinate I. Lets say if I want to have V (the first column in the matrix) scanned from top to bottom (or vice versa) for one specific point in the column to find a z value where if z>100, the one point will assign a value for x (x1) and y (y1).

What approach might come handy to find and assign the x and y value (recorded as x1 and y1) if I have an extracted column if Z>100.

[Jan]

The question is not clear. Where do x,y,and z come from? For what kind of point do you "scan" in V? What is "x(x1)" and "y(y1)"? What is "Z" (uppercase)?

Answer 1

[Jan]

Perhaps:

index = find(F1(:,1) > 100, 1, 'last');  % or 'first'
x1    = x(index);
y1    = y(index);

But this is pure guessing only. Better improve the question.