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c++ Programming Glossary: columnOpenCv 2.3 C - How to isolate object inside image http://stackoverflow.com/questions/10315551/opencv-2-3-c-how-to-isolate-object-inside-image Notice that in the resulting image there is one extra row column of pixels in the border that are not white. Well they are not..
Why 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 elements of this row and swap them with the elements from column 28. The first 8 elements of the row make up a cache line but.. cache line but they'll go into 8 different cache lines in column 28. Remember critical stride is 4 rows apart 4 consecutive elements.. stride is 4 rows apart 4 consecutive elements in a column . When element 16 is reached in the column 4 cache lines per..
Why is my program slow when looping over exactly 8192 elements? http://stackoverflow.com/questions/12264970/why-is-my-program-slow-when-looping-over-exactly-8192-elements iterating over a 2D array You are iterating the matrix column wise instead of row wise. To solve this problem you should interchange..
2D-array as argument to function http://stackoverflow.com/questions/12652598/2d-array-as-argument-to-function bar SIZE Ok Why is it needed to declare the size for the column c share improve this question You can't write void Foo..
What is “cache-friendly” code? http://stackoverflow.com/questions/16699247/what-is-cache-friendly-code example which many people in the field sometimes forget is column major ex. fortran matlab vs. row major ordering ex. c c for.. row major ordering this is stored in memory as 1 2 3 4 in column major ordering this would be stored as 1 3 2 4 . It is easy.. above lets call it M Exploiting the ordering e.g. changing column index first in c M 0 0 memory M 0 1 cached M 1 0 memory M 1..
http://stackoverflow.com/questions/2795023/c-template-typedef .... I want to make a typedef which creates a Vector column vector which is equivalent to a Matrix with sizes N and 1. Something..
How to get memory usage under Windows in C++ http://stackoverflow.com/questions/282194/how-to-get-memory-usage-under-windows-in-c I am looking for is the number reported in the Mem Usage column on the Processes tab of Windows Task Manager. c windows memory..
How do I list the symbols in a .so file http://stackoverflow.com/questions/34732/how-do-i-list-the-symbols-in-a-so-file .so file not in the libraries referenced by it. Seventh column should contain a number in this case. You can extract the corresponding..
What can I use to profile C++ code in Linux? http://stackoverflow.com/questions/375913/what-can-i-use-to-profile-c-code-in-linux 0.1 0.1 0.01 0.001 0.385 1 P o 2 2 0.385 The last column says that for example the probability that f 0.5 is 92 up from..
get 3d coord from 2d image pixel if we know extrinsic and intrinsic parameters http://stackoverflow.com/questions/7836134/get-3d-coord-from-2d-image-pixel-if-we-know-extrinsic-and-intrinsic-parameters How to get homography from pose Column 1 of Homography is column r11 r21 r31 of Pose. Column 2 of Homography is column r12 r22.. is column r11 r21 r31 of Pose. Column 2 of Homography is column r12 r22 r32 of Pose. Column 3 of Homography is column t1 t2.. is column r12 r22 r32 of Pose. Column 3 of Homography is column t1 t2 t3 of Pose. Then normalize dividing everything by t3...
C++ Memory Efficient Solution for Ax=b Linear Algebra System http://stackoverflow.com/questions/1242190/c-memory-efficient-solution-for-ax-b-linear-algebra-system 0 b 0 21 b 1 1 b 2 17 Convert Triplet to Compressed Sparse Column format void umfpack_di_triplet_to_col n n nnz Ti Tj Tx Ap Ai.. efficient sparse matrix methods require Compressed Sparse Column format. Conversion is performed with umfpack_di_triplet_to_col..
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 Size and structure int NumRows const return m_rows int NumColumns const return m_cols int NumElements const return m_data.size.. T Row int row int colBegin 0 int colEnd 1 const vector T Column int row int colBegin 0 int colEnd 1 const private vector T StridedSlice.. colEnd 1 1 template class T vector T SimpleMatrix T Column int col int rowBegin int rowEnd const if rowEnd 0 rowEnd m_rows..
Good hash function for a 2d index http://stackoverflow.com/questions/2634690/good-hash-function-for-a-2d-index called Point. Point is pretty simple struct Point Row row Column column some other code for addition and subtraction of points.. addition and subtraction of points is there too Row and Column are basically glorified int s but I got sick of accidentally..
get 3d coord from 2d image pixel if we know extrinsic and intrinsic parameters http://stackoverflow.com/questions/7836134/get-3d-coord-from-2d-image-pixel-if-we-know-extrinsic-and-intrinsic-parameters is a 3x3 matrix. How to get homography from pose Column 1 of Homography is column r11 r21 r31 of Pose. Column 2 of Homography.. pose Column 1 of Homography is column r11 r21 r31 of Pose. Column 2 of Homography is column r12 r22 r32 of Pose. Column 3 of Homography.. Column 2 of Homography is column r12 r22 r32 of Pose. Column 3 of Homography is column t1 t2 t3 of Pose. Then normalize dividing..
Denormalized floating point in Objective-C? http://stackoverflow.com/questions/9350810/denormalized-floating-point-in-objective-c ARM FPSCR 08x n x with the following surprising result. Column 1 a float divided by 2 for every iteration Column 2 the binary.. result. Column 1 a float divided by 2 for every iteration Column 2 the binary representation of this float Column 3 the time.. iteration Column 2 the binary representation of this float Column 3 the time taken to sum this float 1e7 times You can clearly..
Using Quaternions for OpenGL Rotations http://stackoverflow.com/questions/9715776/using-quaternions-for-opengl-rotations with it void Quaternion RotationMatrix GLfloat Matrix Column 1 Matrix 0 a a x x y y z z Matrix 1 2 x y 2 a z Matrix 2 2 x.. y z z Matrix 1 2 x y 2 a z Matrix 2 2 x z 2 a y Matrix 3 0 Column 2 Matrix 4 2 x y 2 a z Matrix 5 a a x x y y z z Matrix 6 2 y.. z Matrix 5 a a x x y y z z Matrix 6 2 y z 2 a x Matrix 7 0 Column 3 Matrix 8 2 x z 2 a y Matrix 9 2 y z 2 a x Matrix 10 a a x..
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