comparing the maximum value of a matrix to the other values

Hello, I have a question. I need to compare the maximum value in an array to the other elements in an array and check if it is greater than 1.2 times the other elements. How can I do this in matlab? I'd prefer it if it is a simple command since I'm already doing this within a loop. I know max will give me the maximum but how to compare it with the other elements?

Answer 1

[KSSV]

A = randperm(10,5) ;
B = randperm(20,5) ;

iwant = max(A)/max(B)

fprintf('max of A is %f times to max of B\n',iwant)

[SSG_newbiecoder]

I dont think you understood the question. I have the maximum of an array with me. I need to check if the maximum is greater than the other array elements by 1.2.

[KSSV]

Yes....you divide the maximum with other arrays...if the ratio is 1.2..you got what you want..isn't it? If it is times of divide..or subtract if you are looking for difference.

[SSG_newbiecoder]

I have an array X=[1 2.2 3.5 3.8 2.8 2.9]. Maximum is 3.8. But I need to check if this maximum is 1.2 times the other 5 elements in the array.

[KSSV]

X=[1 2.2 3.5 3.8 2.8 2.9] ;

R = X./max(X) ;
idx = abs(R-1.2)<10^-3

Answer 2

[Walter Roberson]

If you want to know whether it is greater than 1.2 for all of the elements, then

if max(FirstArray) > 1.2 * max(SecondArray)

If you want to know whether it is greater than 1.2 for some element then

if max(FirstArray) > 1.2 * min(SecondArray)

I recommend that you explicitly comment the behavior you want when some of the values in the second array might be negative. Is -1.3 "greater than" 1.2 times -1 because the value has greater distance from 0 ?

[SSG_newbiecoder]

Ok I will make myself clear. A=[1 1.5 2 2.5 3]. The maximum is 2.5. Now I need a matrix B which does not have this maximum, 2.5,B=[1 1.5 2 3] so that I can check the condition. (I have to see if the maximum is greater than 1.2 times the other values in A)

[Walter Roberson]

I cannot be of further assistance in this matter until you resolve the question of what you want done with negative values.

[SSG_newbiecoder]

There wont be any negative values as the above array contains only modulus values

[Birdman]

Check my answer.

[SSG_newbiecoder]

Or if you can suggest a method to find an array element that is 1.2 times that of the other elements in the array, that will solve the problem without all the above hassle