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c++ Programming Glossary: transposeWhy is transposing a matrix of 512x512 much slower than transposing a matrix of 513x513? http://stackoverflow.com/questions/11413855/why-is-transposing-a-matrix-of-512x512-much-slower-than-transposing-a-matrix-of for me Disclaimer I know the function doesn't actually transpose the matrix because of the double swap of elements but it makes.. time.h #include iostream int mat MATSIZE MATSIZE void transpose for int i 0 i MATSIZE i for int j 0 j MATSIZE j int aux mat.. MATSIZE j mat i j i j int t clock for int i 0 i SAMPLES i transpose int elapsed clock t std cout Average for a matrix of MATSIZE..
Writing Python bindings for C++ code that use OpenCV http://stackoverflow.com/questions/12957492/writing-python-bindings-for-c-code-that-use-opencv o const npy_intp _strides PyArray_STRIDES o bool transposed false for int i 0 i ndims i size i int _sizes i step i size_t.. 0 step 1 std swap size 0 size 1 std swap step 0 step 1 transposed true if ndims 3 size 2 CV_CN_MAX step 1 elemsize size 2 ndims.. the reference counter m.allocator g_numpyAllocator if transposed Mat tmp tmp.allocator g_numpyAllocator transpose m tmp m tmp..
Get the first column of a matrix represented by a vector of vectors http://stackoverflow.com/questions/15778377/get-the-first-column-of-a-matrix-represented-by-a-vector-of-vectors 0 0 foo 0 1 foo 0 2 foo 0 3 foo 0 4 Put another way can I transpose foo so that the following three things are true foo_transpose.size.. foo so that the following three things are true foo_transpose.size cols foo_transpose 0 .size rows foo_transpose 0 foo 0 0.. three things are true foo_transpose.size cols foo_transpose 0 .size rows foo_transpose 0 foo 0 0 foo 0 1 foo 0 2 foo 0 3..
What is the fastest way to transpose a matrix in C++? http://stackoverflow.com/questions/16737298/what-is-the-fastest-way-to-transpose-a-matrix-in-c is the fastest way to transpose a matrix in C I have a matrix relatively big that I need to.. matrix in C I have a matrix relatively big that I need to transpose. For example assume that my matrix is a b c d e f g h i j k.. on your application but in general the fastest way to transpose a matrix would be to invert your coordinates when you do a look..
Implementation of a “hits in last [second/minute/hour]” data structure http://stackoverflow.com/questions/18364490/implementation-of-a-hits-in-last-second-minute-hour-data-structure call it every second and increment the position and will transpose runningTotal from one histogram to the next every RingSize so..
how to swap array-elements to transfer the array from a column-like into a row-like representation http://stackoverflow.com/questions/3009379/how-to-swap-array-elements-to-transfer-the-array-from-a-column-like-into-a-row-l
Mapping elements in 2D upper triangle and lower triangle to linear structure http://stackoverflow.com/questions/4803180/mapping-elements-in-2d-upper-triangle-and-lower-triangle-to-linear-structure the X means those cells don't exist and instead their transpose is to be used 0123 X456 XX78 XXX9 Here is a 7x7 matrix with..
Rotate cv::Mat using cv::warpAffine offsets destination image http://stackoverflow.com/questions/7813376/rotate-cvmat-using-cvwarpaffine-offsets-destination-image is much simpler than all this warp thing . You can use cv transpose and cv flip to rotate an image by 90 degrees. Here it is Mat.. degrees. Here it is Mat src imread argv 1 1 cv Mat dst cv transpose src dst cv flip dst dst 1 imwrite rotated90.jpg dst I share..
Algorithm for slicing planes (in place) out of an array of RGB values http://stackoverflow.com/questions/8465950/algorithm-for-slicing-planes-in-place-out-of-an-array-of-rgb-values Simple In Place Algorithm for In Shuffle describes how to transpose matrix of 2 N and gives a hint how to do it for other cases.. Or use an algorithm which writes each value to its transposed place then does the same for the value from that place and.. iostream #include bitset #include vector enum N 8 void transpose std vector char a std bitset 3 N b for int i 1 i 3 N i if b..
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