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Multiply the vector organs

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Eran Shvartzman
Eran Shvartzman 2017-12-27
编辑： John D'Errico 2017-12-27
How to multiply the vector parts without using a prod function
For example: s=[1 2 3 4], v=24

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回答（2 个）

John D'Errico
John D'Errico 2017-12-27
编辑：John D'Errico 2017-12-27
You want to multiply s*v, so perform that multiplication, but without using the * operator? May I ask why you want to do such a silly thing, instead of just doing s*v?
As long as one of them is a scalar, then conv will suffice.
conv(s,v)
It will be slower, less efficient. It will serve absolutely no purpose.
(See the comments in case I was wrong in interpreting the ambiguous question.)
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Matt J
Matt J 2017-12-27
编辑：Matt J 2017-12-27
Note that this survives even if one of the elements of s is zero.
So, incidentally, does exp(sum(log(s))).
>> v=exp(sum(log([0,1,2,3])))
v =
0
Negative numbers work, too.

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Matt J
Matt J 2017-12-27
编辑：Matt J 2017-12-27
for i=1:4
v=exp(sum(log(s)));
end
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John D'Errico
John D'Errico 2017-12-27
You may be right here. the request may be to write v=prod(s), without use of prod, instead of forming the product s*v.

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