Inequality problem

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Synchronie
Synchronie 2012-1-21
Hi.... Does the following inequality work on Matlab:
for col=1:1:num_cols
if (0.00>(real_qn1(col))<0.25)
real_c(col)=(1/sqrt(2));
else if (0.25>(real_qn1(col))<0.50)
real_c(col)=(-1/sqrt(2));
else if (0.50>(real_qn1(col))<0.75)
real_c(col)=(-sqrt(2));
else if (0.75>(real_qn1(col))<1.00)
real_c(col)=(sqrt(2));
end
end
end
end
end
I tried it.. But it's giving me inverted results..
Thank you

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采纳的回答

Dr. Seis
Dr. Seis 2012-1-21
You have to split them up... instead of:
A < X < B
you have to do:
(A < X) && (X < B)
Incidentally, make sure you are using good logic. At your first if you have:
0.00 > X < 0.25
which is the same(*) as saying:
(X < 0.0) && (X < 0.25)
The second part is redundant, because if X is less than 0.0 it is also less than 0.25
(*) By saying "same" I mean the way you would interpret the statement. Matlab executes those two statements very differently.
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Walter Roberson
Walter Roberson 2012-1-21
"else if" with a space is valid; it just requires one more "end" than otherwise.
Dr. Seis
Dr. Seis 2012-1-21
I am not arguing against it because it is not valid, I am arguing against it because it is not efficient (from a code writing/reading standpoint).

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更多回答（1 个）

Synchronie
Synchronie 2012-1-22
Thanks a lot for your suggestions.. I paid attention to the inequality sign and used elseif(without space) and it worked perfectly well..

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