error in using the sum function

I am getting an error I can't understand.

I attached the code and a photo.

thanks!

clear all
close all
clc
m=5; %number of groups
n=10 %size of each group
sz=[m n];
sum=0;
G=0+(100-0)*rand([sz]);
G1=G(1,:);
sum(G1);

[jonas]

It can be quite useful to read the error message returned by MATLAB.

" 'sum' appears to be both a function and a variable. If this is unintentional, use 'clear sum' to remove the variable 'sum' from the workspace."

Answer 1

[Adam Danz]

You are defining a variable named sum here

sum=0;

and then later you try to index that variable by a vector of non-integers. It's like doing this:

v= 6; 
v([310.15324, 235.3463, 501.346])

If you're trying to use the sum() function, you'll need to use a different variable name.

Answer 2

[ANKUR KUMAR]

You have already defined sum as a variable

clc
clear
m=5; %number of groups
n=10 %size of each group
sz=[m n];
G=0+(100-0)*rand([sz]);
G1=G(1,:);
sum(G1)
sum(G,1)%along first dimension
sum(G,2) %along second dimension