How to find corresponding x values for array of y values

Hello,

I have imported data from an image processing software where I have a series of stacked x-y coordinates (from a stacked image). My raw data consists of one column of x-values and over 400 columns of y-values. In MatLab, I currently am able to produce a1x465 array with each minimum value of y from each y column. How can I find the cooresponding x-value for each min value of y?

Answer 1

[Cris LaPierre]

Use the following syntax

[M,I] = min(___)

When you are taking the min of an mxn array, I is a vector containnig the row numbers of the minimum values. Use that to index into your column of X values.

x = [3;10];
[MN,I] = min(rand(2,3))

MN = 1×3

0.2223 0.2202 0.8156

I = 1×3

2 1 2

x(I)

ans = 3×1

10 3 10

[Meagan Rhyne]

Thank you! That's exactly what I needed. I'm relatively new to MatLab and don't quite know what commands exist for these things. I appreciate your help!

Answer 2

[David Hill]

Assuming the first column is x and the remaining columns y of matrix M

[min,idx]=min(M(:,2:end));
x=M(idx,1);