Translating MATLAB code into C

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Hiroshi Nakamura
Hiroshi Nakamura 2015-3-1
编辑： Hiroshi Nakamura 2015-3-1
Hello guys, I was just wondering if anyone can help translate my code into C as I don't have MATLAB Coder . I am more familiar with MATLAB's array indexing and I believe that C's array indexing is a little too complicated for a beginner like me. I'd appreciate it if you could walk me through the steps..
I am currently stuck at these two lines and I believe C won't allow me to do array indexing the same way MATLAB does:-
b = a(x:x+1, y:y+1);
a(x:x+1, y:y+1) = b;
Here is my entire code :-
a = [1 2 3 4; 2 3 4 5; 3 4 5 6; 4 5 6 7];
c = dctmtx(2);
q_mtx = [16 11; 12 12];
for x = 1:2:M
for y = 1:2:N
b = a(x:x+1, y:y+1); %<----HOW DO I DO THIS IN C???
b = c*b*c';
b = b./q_mtx ;
a(x:x+1, y:y+1) = b;
end
end

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采纳的回答

Walter Roberson
Walter Roberson 2015-3-1
for (xoff = 0, xoff <= 1, xoff++)
for (yoff = 0, yoff <= 1, yoff++)
b[yoff][xoff] = a[y+yoff][x+xoff];
That is, you use a loop. Unless you want to start into memcpy().
Notice that I reversed the order of the indices. C arrays are row-major instead of column-major.

更多回答（1 个）

Hiroshi Nakamura
Hiroshi Nakamura 2015-3-1
编辑：Hiroshi Nakamura 2015-3-1
Thank you so much Walter! I really appreciate it! One more question. What are y and x again in you loop? Also if I were to do it using memcopy, how would I go about doing it? Thanks again!
for (xoff = 0, xoff <= 1, xoff++)
for (yoff = 0, yoff <= 1, yoff++)
b[yoff][xoff] = a[y+yoff][x+xoff];

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