loop for matlab array

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best16 programmer
best16 programmer 2016-11-23
编辑： James Tursa 2016-11-23
i have a problem with for loop.we have a vector a=[0 1 1 1 0] and a vector b=[1 1 1 1 1]
for i = 1:length(a)
if a(i)==0
c = [-1.*b] ;
else if a(i)==1
c = [1.* b];
end
end
the loop works only for a(1)=0 and stops.

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回答（3 个）

Geoff Hayes
Geoff Hayes 2016-11-23
Try removing the space between the else if. Re-write this as
if a(i)==0
c = [-1.*b] ;
elseif a(i)==1
c = [1.* b];
end
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best16 programmer
best16 programmer 2016-11-23
yes i know,i'm trying to display the result c in a edit text
Image Analyst
Image Analyst 2016-11-23
Then just do
handles.edit1.String = sprintf('%d ', c);
This will convert the vector to a string and put it into the edit text box on your GUI.

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Image Analyst
Image Analyst 2016-11-23
Maybe you wanted elseif instead of "else if". This works and does several iterations:
a=[0 1 1 1 0]
b=[1 1 1 1 1]
for i = 1:length(a)
if a(i)==0
c = [-1.*b]
elseif a(i)==1
c = [1.* b]
end
end
Of course there are better ways to do that and no experienced MATLAB programmer would do that operation like that.
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best16 programmer
best16 programmer 2016-11-23
the problem is how can we display all the c values in a edit text
Image Analyst
Image Analyst 2016-11-23
They will all be displayed because there is no semicolon at the end of the line. Did you actually try it and look in the command window?

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Andrei Bobrov
Andrei Bobrov 2016-11-23
c = (a(:)*2 - 1)*b(:)';
or
c = (a(:)*2 - 1).*b(:);

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