How to rotate image without using "rotate" keyword in mathcad?

Forum|Forum|7 years ago
September 29, 2018
3 replies
9979 views

Example: A=(0,1,2) now by using rotate keyword Result = rotate(A,180); Result = (2,1,0). But how to do this without keyword ?

V

ValeryOchkov

24-Ruby IV

May be this help you

M

Mathcad111

Author

1-Visitor

yes i'm aware of that but how to do for random degrees for ex: rotate(A,41) or rotate(A,33)?

W

Werner_E

25-Diamond I

"rotate" is used to rotate a picture(matrix) by a given angle in degree with some sort of antialiasing.

Why would you like to program that function yourself and not use the built-in one?

M

Mathcad111

Author

1-Visitor

Yes i'm aware of that keyword but how to do without keyword ? or is it possible to see how that "rotate" function program has written in mathcad ?

W

Werner_E

25-Diamond I

@Mathcad111 wrote:

Yes i'm aware of that keyword but how to do without keyword ?

You haven't answered my question which simply was: WHY?

@Mathcad111 wrote:

or is it possible to see how that "rotate" function program has written in mathcad ?

No, not that I would be aware of. The algorithms used in Mathcad are not a secret but are hard coded and so can't not be inspected unless you have access to the source code of the program.

As far as I am aware many algorithms implemented in Mathcad followed the "Numerical Recipes" and the four volumes of "Knuth - The Art of Computer Programming" but I am not sure if this also applies to the algorithms for manipulating bitmaps.

But if you study Books about computer graphics you sure will find various ways and algorithms how to rotate a bitmap picture and implement anti-aliasing.

Searching the net will reveal a lot of possible implementations, too. Some less, some more elaborate.

As one example you may ave a look at https://www.codeproject.com/Articles/12230/Anti-Aliased-Image-Rotation