What is wrong with my code short simple function using only - if,for,length and variables)?

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ilona
ilona 2013-12-15
评论： ilona 2013-12-16
I needed to write a function that uses only if for length and variables and calls another function - valFind(that runs very well-added below), my function gets:1) a vector 2)an arrays of numbers to search for and brings back the first places in which those numbers appear in the vector (or 0 if they don't appear) for example:
% code
a=[2 4 6 8 4 2]
b=[2 8 9]
c=valFindAll(a,b) --> [1 4 0]
this is valFind (runs fine the problem is in the text function)
% code
function [result] = valFind(a,b)
result = [];
for ii=1:length(a)
if a(ii) == b
result = [result ii];
end
end
this is the function that (I don't know why) doesn't run
% code
function [resultVec] = valFindAll(a,v)
resultVec =[];
for ii=1:length(v)
[result]=valFind(a,v(ii));
if result == []
resultVec = [resultVec 0];
else
resultVec = [resultVec result(1)];
end
end

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采纳的回答

Huseyin Kaya
Huseyin Kaya 2013-12-15
编辑：Huseyin Kaya 2013-12-15
Just change
result == []
with
length(result) == 0
and everything will work fine.

更多回答（1 个）

Jan
Jan 2013-12-15
You can use isempty(result) instead of result == [].
Another more efficient method:
function [resultVec] = valFindAll(a,v)
resultVec = zeros(1, length(v));
for ii = 1:length(v)
result = valFind(a,v(ii)); % No brackets around left hand side
if ~isempty(result)
resultVec(ii) = result;
end
end

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