How can i find the maximum of three variables?

Hi, I have to find the maximum of three variables A, B, C and store the result in D. thanks

[Sara Hafeez]

use max. d=max(a,b,c)

[Jan]

Have you tried this, Sara?

d = max(2,3,4)

According to the help text this fails.

Answer 1

[Matt J]

 D=max([A,B,C]);

[Jan]

I assume, this is a homework question.

[Matt J]

I suppose. Can't be worth more than 1 point, though...

Answer 2

[Jan]

How would you find the maximum of two variables?

docserach maximum

Then if you have the maximum of two variables, you can compare it to the third one.

Answer 3

[pshymn]

maybe, i am a little late, but i experienced the same problem. here is my solution. it works, tried. function which finds maximum of three variable.

    function [p] = MAX(g,h,j)
if g>h && g>j
    p=g;
elseif h>g && h>j
    p=h;
else
    p=j;
end

[Walter Roberson]

That code assumes scalar values. It also assumes no nan values.

Answer 4

[Image Analyst]

In general, for A, B, and C being numerical arrays of any size (possibly different than each other):

% Define 3 double matrixes of different sizes
A = rand(3);
B = rand(4);
C = rand(5);

% Now get the max overall
D = max([A(:), B(:), C(:)])  % Note use of (:) to turn arrays into vectors.

If they're cell arrays or structures though, let us know because that would be different.

[Jan]

If A, B, C hav different sizes, [A(:), B(:), C(:)] fails. But [A(:); B(:); C(:)] with the semicolons for vertical concatenation works.

Answer 5

[Sarah Crimi]

if it is vectors of different sizes, you would have to do max(max(a),max(b)),max(max(b),max(c)). So, it takes max of the first and second vectors and compares the values, and max of the second and third vectors, then takes the max of those two numbers.

[Stephen23]

"if it is vectors of different sizes you would have to do..."

Or you can just call max once (as Jan Simon showed earlier):

max([a(:);b(:);c(:)])

[Sarah Crimi]

Oh yes, I see. This makes it into one vector then takes the max.