matlab - Find an index position within a matrix -


in example have matrix (a)

a = 1       2       3       7     0.9     0.6     0.2    0.2     0.8     17      72     15

my goal search through matrix , find index position of highest value not >= 72. matrix illustration know how matrix of dimension rows , columns equal (2x2 3x3 4x4 ...)

in case calculate fact highest number within constraints

rows=3 cols = 2

thanks

step 1: determine value you're interested in. 

val = max(a(a<72));

step 2: find index of element corresponds value:

[r,c] = find(a==val,1,'first'); #%only take first element (this can changed) #r row index, c column index

you use linear indexing , ind2sub:

l = find(a==val); #%this time, find elements meet criteria [r,c] = ind2sub(size(a),l);

here links documentation find , ind2sub. don't have store value (val) of interest either, can put in 1 line.


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