how to translate this macro

I have this "macro"

err = (dd_y(x1:x2)'-yi(1:end)).^2

I would translate this into normal code runnable in every environment, not only Matlab. What can I do?

[Titus Edelhofer]

Hi, what do you mean by "every environment"? Second, there is a "(" missing somewhere in your macro ...

Titus

[marianoc84]

Every environment doesn't means nothin special, I just need to report that code in a sort of pseudo code readeable even to a person who doesn't know matlab.

Yes, I was miss the first (, this is correct now. :)

Answer 1

[Friedrich]

Hi,

in general some pseudo code which can be run anywhere would be

for(i=0;i<=x2-x1;i++)
    err[i] = (dd_y[i+x1] - yi[i])*(dd_y[i+x1] - yi[i])

The correct syntax and data types depending on the programming language you like to use. In addition make sure that dd_y(x1:x2) has the same amount of elements as yi which you like to access to avoid Index Out Of Bounds Exceptions / Segmentation Violation.

[Walter Roberson]

I would not call that pseudo-code, I would call that C code. Understanding it properly requires knowledge of C's trinary looping construct.

Closer to pseudo-code would be

i = 0;

while i <= x2 - x1 {

err[i] = (dd_y[i+x1] - yi[i]) * (dd_y[i+x1] - yi[i]);

i = i + 1;

}

However, both this version and your version would have problems if dd_y could contain complex numbers, as the original code uses the conjugate transpose rather than the plain transpose.