Convert 0×1 empty double column vector to zero

2019 8 30
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更新时间：2024 5 15
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I am running a code and some of the parameters are 0×1 empty double column vector. Is there any way to convert these to zero?
I mean isntead of daying empty double, assign zero.

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James Tursa
James Tursa 2019-8-30
We need more details. Are you tring to change the behavior of a function or calculation that returns empty variables? Are you tring to change empty variables in the workspace to 0's? Are these empty variables part of a cell or struct array?
Corinna
Corinna 2024-5-15
just use sum(0×1 empty double column vector)
the result is 0

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James Tursa
James Tursa 2019-8-30

2 个投票

Is this construct all you need?
if( isempty(x) )
x = 0;
end

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Thanks. I have a lot of if in the code. Any other option? preferred to be one command
Steven Lord
Steven Lord 2019-8-30
Write a small function.
function x = replaceWith0IfEmpty(x)
if isempty(x)
x = 0;
end
end
Call that function where you want to replace empty matrices with 0.
y = replaceWith0IfEmpty(y);
James Tursa
James Tursa 2019-8-30
@Zeynab: Again, we need more details. Can you modify the function/calculation that is producing these empty variables?
@james I am doing some calculations for example a=b+c. it is in the loop and c is changing. Sometimes c is "0×1 empty double column vector" and sometimes it is a reall number. When it is empty, I get error in a=b+c. That's why I need to make sure that if c is empty, just replace it with zero. I want to avoid using if conditional.
James Tursa
James Tursa 2019-8-31
What is the calculation you are doing that is producing the empty variable?

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