How to use a floating point number in max() function?

Hi, I am trying to find a maximum number that is a float number using max().

 allWidths = bb(3:4:end);
 allHeights = bb(4:4:end);
 aspectRatio = [allWidths./allHeights ;  allHeights  ./ allWidths];
 aspectRatios = max(aspectRatio, [], 0.5);

but the line

 aspectRatios = max(aspectRatio, [], 0.5);

shows an error. How could I use a floating point number to find the maximum value??

[Stephen23]

max(aspectRatio, [], 0.5);

What is the 0.5-th dimension of an array?

Why not simply:

max(aspectRatio)

[Dominic]

No. Actually I have some blobs in a binary image and have calculated aspect ratios. Now I want to keep only those who have aspect ratios from 0.5 to 1.5.

0.5 is the lowest value that i want to set first in the variable aspectRatios and after that i have applied another condition to set maximum value 1.5 by following statement.

 keeperIndexes = find(aspectRatios < 1.5);

but i am unable to set 0.5 in lowest. if there is a simple way to keep those blob in the binary image that has aspect ratio from 0.5 to 1.5 please share.

Answer 1

[Stephen23]

aspectRatio = allWidths./allHeights;
idx = aspectRatio>0.5 & aspectRatio<1.5;

find is likely not required, as logical indexing is simpler and more efficient.