i cannot find the minimum values for matrix.

theres no problem to find maximum values. but when it come to find minimum values, got error as below.

can somebody tell me what is the error mean ? and how exactly to find the minimum values in each colum in matrix T ?

Thank you,

T =

    1.0000  242.0000   24.7385   33.8409    1.0000
    2.0000  716.0000   83.2151   50.1744    1.0000

>> M = max (T)

M =

    2.0000  716.0000   83.2151   50.1744    1.0000

>> N = min (T)
Array indices must be positive integers or logical values.

[Erivelton Gualter]

I could not reproduce this error. The following works fine to me.

T =[1.0000, 242.0000, 24.7385, 33.8409, 1.0000; ...
    2.0000, 716.0000, 83.2151, 50.1744, 1.0000]
M = max (T)
N = min (T)

Answer 1

[Erivelton Gualter]

Alternative method to find the minium value for each column:

min(T,[],1)

[ARIFF HAIKAL]

wow. i got this sir. thank you! :)

how if i only want a specific column to come out ?

[Erivelton Gualter]

Here:

column = 2; % Pick column indice
min(T(:,column))

[Daniel M]

This answer shouldn't have worked. You must have inadvertently solved the issue of overloading the min function.

Otherwise, to get the min of just some columns, only pass in those columns:

T = [1.0000  242.0000   24.7385   33.8409    1.0000; 2.0000  716.0000   83.2151   50.1744    1.0000];
cols = [1 3 5]; % pick these columns
N = min(T(:,cols));

[ARIFF HAIKAL]

hi brothers,

yup it got 1 overwritten variable 'min'. so i put 'clear min' .

and it succeed. this one also " N = min(T(:,cols)); " can be used.

Thank you. :)

Answer 2

[Daniel M]

You must have overwritten 'min' as a variable, and doing min(T) is trying to index into a variable at non-integer positions. That, or you've overloaded the function min with another. To check for this, what is the output of

which min -all

Also, copy and paste the following code exactly, and tell me if it works

clear all
T = [1.0000  242.0000   24.7385   33.8409    1.0000; 2.0000  716.0000   83.2151   50.1744    1.0000];
min(T)