How can I solve the following error?

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Zeinab Hassanzadeh
编辑： Fangjun Jiang 2022-7-6
For an arbitrary matrix, I want to sum the entries of each row of it.
I use the command sum(A,2) for the square matrix A. But I encounter the following error
"Index in position 1 is invalid. Array indices must be positive inteders or logical values"

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回答（2 个）

Star Strider
Star Strider 2022-7-6
Somewhere you have a variable named ‘sum’ and this is throwing the error.
The solution is to re-name the variable to something else that makes sense in the context of the code and does not overshadow any MATLAB function names.
Fangjun Jiang
Fangjun Jiang 2022-7-6
Ran in:
Most likely, you have a variable called "sum". Clear it first and then run your code
clear sum;
A=magic(5);
sum(A,2)
ans = 5×1
65 65 65 65 65

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