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Finding Nonzero Elements in a Vector

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Sophie Culhane
Sophie Culhane 2020-9-20
关闭： MATLAB Answer Bot 2021-8-20
In a assignment I am working on, we are tasked with writing a MATLAB function that takes as input a nonempty vector v and returns the product of the nonzero elements in the vector. If there are no nonzero elements, a value of 1 is returned. As of now, I have a working program that calculates the correct answer, however it computes the product of all elements, instead of all nonzero elements. I am asking for help on how to make this simple change in my program. Below is what I have so far.
function prod = ex1(v)
%
%
vLength = length(v);
prod = 1;
CurrentPosition = 1;
for CurrentPosition = 1:vLength
prod = prod * v(CurrentPosition);
CurrentPosition = CurrentPosition + 1;
end
  1 个评论
Walter Roberson
Walter Roberson 2020-9-20
By the way, the code can be vectorized to less than 20 characters (excluding the "function" line.)

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回答（1 个）

James Tursa
James Tursa 2020-9-20
编辑：James Tursa 2020-9-20
You need to wrap this statement with an if-test and only execute it if v(CurrentPosition) is non-zero:
prod = prod * v(CurrentPosition);
Also, get rid of the following line. You should not be manually altering the for-loop index variable within the loop:
CurrentPosition = CurrentPosition + 1;
You can get rid of this line also, since it doesn't actually accomplish anything useful.
CurrentPosition = 1;

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