Minimum value with row index

I wrote the following code to get a minimum positive value and the row index as well but the output is giving wrong row index. Anyone can help me?

The answer should be...minba=0.005 ri=9

clc; clear all;

ba=[52 15 52 44 44 0 -25 -4 .05]; [minba ri]=min(ba((ba>0)))

Answer 1

[Sean de Wolski]

idx = min(find(ba==minba))

[Walter Roberson]

idx = find(ba==minba,1);

[Matt Fig]

I understand the question to be "How do I find the minba and ri," not, "Given, minba, how to find the ri?"

Answer 2

[Matt Fig]

If minba is not known before hand (the general case, and what it sounds like you want to have), then:

ba = [52 15 52 44 44 0 -25 -4 .05];  % Your data...
ba(ba<=0) = inf;  % Take non-positive values out of the picture.
[minba,ri] = min(ba)  % Find the min and index.
minba =
     0.05
ri =
     9

A faster alternative to the above, if the number of non-positives is a large fraction of the whole:

minba = min(ba((ba>0)));
ri = find(ba==minba,1);

[Sean de Wolski]

Out of curiosity, is it faster to overwrite with inf or to use find?

[Matt Fig]

How would you use FIND if minba wasn't known before hand? I think anything that could do this using FIND would be slower than what I showed...

[Matt Fig]

But I was wrong. This is faster indeed, when the number of non-positives is a large fraction of the whole:

minba = min(ba((ba>0)));

ri = find(ba==minba,1);

Answer 3

[Walter Roberson]

idx = find(ba > 0,1);
minba = ba(idx);

[Sean de Wolski]

This just finds the first value greater than zero; not necessaryily the min

minba = 52;

Your comment on my answer appears to be the best!

[Matt Fig]

I understand the question to be "How do I find the minba and ri," not, "Given minba, how to find the ri?"

[Walter Roberson]

Matt, we are working from the original code [minba ri]=min(ba((ba>0)))

Sean: good point. I'll have to rethink this.

[Sean de Wolski]

Congrats Walter on your 1000th answer!

[Matt Fig]

@Walter

Qouting the OP (without quotes of course)

I wrote the following code to ...

The answer _should_ _be_...minba=0.005 ri=9

So I assume Mohammad wanted to be shown the _correct_ way to get both minba and ri.