MATLAB: Equality

equalitylogical operationMATLAB

I am a newbie to Matlab, maybe my question is too simple, but I couldn't solve it anyway, I will appreciate any help:)

From command window, i give following commands:

Z(1) = 182 - (7/24);
for i = 2:110; Z(i)=Z(i-1)+(1/24); end;
mini = 186;

from this point, when i ask:

Z(104)
mini

i get

186.0000
186

respectively. but for equality check

Z(104) == mini

i get answer zero. What is the problem, why i dont get 1 as answer?

Best Answer

See the FAQ, which should explain it http://matlab.wikia.com/wiki/FAQ#Why_is_0.3_-_0.2_-_0.1_.28or_similar.29_not_equal_to_zero.3F

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MATLAB: Equality error

Dear for comparing the string you should use strcmp function.

ex.

a(1).name ='2pm'; a(2).name='SNSD'; a(3).name = '2pm';
strcmp(a(1).name , a(2).name ) % this will return 0
strcmp(a(1).name, a(3).name) % this will return 1.

MATLAB: Logical vector equality

all(vec1==vec2)

and if you want to ignore the difference between column and row vectors do

all(vec1(:)==vec2(:))

There's also this way to compare

isequal(vec1,vec2)

With the isequal you don't have the problem with the dimensions mismatch like you have with the case vec1==vec2

Best Answer

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