Error using * inner matrix dimensions must agree

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Subham Burnwal
Subham Burnwal 2015-4-14
编辑： Star Strider 2015-4-14
I have written a function in which one line is B = A*i; where A is a matrix and i is a scalar quantity.
i am calling this function many times around 4000 and the problem is for some time this statement is executing properly and after some time this error is showing at this line i do not know why. One more thing is that the function is executing different number of times when i am running it again and again.
Thank you.

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回答（2 个）

James Tursa
James Tursa 2015-4-14
Most likely i is not a scalar, hence the error. Try stopping on the error and then examining the dimensions to see what is going on.
dbstop if error
% then run your code
  2 个评论
Subham Burnwal
Subham Burnwal 2015-4-14
Now In the workspace it is showing i as an empty matrix at the break point. How can i remove this error now.? i want to use i as a scalar. Thank You.
James Tursa
James Tursa 2015-4-14
编辑：James Tursa 2015-4-14
Look upstream in your code. Where do you define i? You must be defining it somewhere otherwise i would default to the inbuilt imaginary unit.

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Star Strider
Star Strider 2015-4-14
编辑：Star Strider 2015-4-14
If ‘i’ is always a scalar, it should’t be throwing that error. Add this line before the ‘B’ assignment:
if sum(size(i)) ~= 2
fprintf(['\n\ti = ' repmat('%f ', 1, length(i)) '\n'], i)
end
B = A*i;
That will tell you if ‘i’ has somehow become a vector.

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