Inequality problem

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

Answer 1

[Dr. Seis]

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.

[Dr. Seis]

Also you are using else<space>if, when I think you want elseif (no space between)

[Walter Roberson]

"else if" with a space is valid; it just requires one more "end" than otherwise.

[Dr. Seis]

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).

Answer 2

[Synchronie]

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