matrix 228

  1. How to define a two-dimensional array in Python
  2. Transpose/Unzip Function (inverse of zip)?
  3. How can I index a MATLAB array returned by a function without first assigning it to a local variable?
  4. How do you rotate a two dimensional array?
  5. What are the differences between numpy arrays and matrices? Which one should I use?
  6. Bomb dropping algorithm
  7. What are the most widely used C++ vector/matrix math/linear algebra libraries, and their cost and benefit tradeoffs?
  8. Difference between numpy.array shape (R, 1) and (R,)
  9. Performance of Java matrix math libraries?
  10. Should I use a data.frame or a matrix?
  11. Looping in a spiral
  12. how does multiplication differ for NumPy Matrix vs Array classes?
  13. Finding row index containing maximum value using R
  14. Numpy matrix to array
  15. Select rows of a matrix that meet a condition

  16. Reshape three column data frame to matrix (“long” to “wide” format)
  17. numpy matrix vector multiplication
  18. R memory management / cannot allocate vector of size n Mb
  19. How can I apply a function to every row/column of a matrix in MATLAB?
  20. Apply a function to every row of a matrix or a data frame
  21. How do I make a matrix from a list of vectors in R?
  22. How do I find the length (or dimensions, size) of a numpy matrix in python?
  23. Transposing a 2D-array in JavaScript
  24. Android: How to rotate a bitmap on a center point
  25. Why are quaternions used for rotations?
  26. Very large matrices using Python and NumPy
  27. How can I create a correlation matrix in R?
  28. Join tiles in Corona SDK into one word for a Breakout game grid?
  29. Convert a matrix to a 1 dimensional array
  30. How do I iterate through each element in an n-dimensional matrix in MATLAB?
  31. How can I count the number of elements of a given value in a matrix?
  32. Find the row representing the smallest integer in row wise sorted matrix
  33. Function for 'does matrix contain value X?'
  34. inverting a 4x4 matrix
  35. Recommendation for C# Matrix Library
  36. How to use onSensorChanged sensor data in combination with OpenGL
  37. How to subset matrix to one column, maintain matrix data type, maintain row/column names?
  38. Multiply rows of matrix by vector?
  39. Elegant indexing up to end of vector/matrix
  40. How to convert a matrix to a list of column-vectors in R?
  41. Numpy ‘smart’ symmetric matrix
  42. Confusion between C++ and OpenGL matrix order (row-major vs column-major)
  43. Python Inverse of a Matrix
  44. Looking for an explanation of post/pre/set Translate (in Matrix object) and how to use them
  45. In WebGL what are the differences between an attribute, a uniform, and a varying variable?
  46. Sum a list of matrices
  47. Split a large dataframe into a list of data frames based on common value in column
  48. data type not understood
  49. All Levels of a Factor in a Model Matrix in R
  50. Convert a 1D array to a 2D array in numpy