By Ash Matheson
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Extra info for Matlab - C Math Libary User's Guide 1.2
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3 Assign data to the variables that will be saved to a file. x stores a 4-by-4 array that contains randomly-generated numbers. y stores a 7-by-7 magic square. z contains the eigenvalues of x. mat". You can save any number of variables to the file identified by the first argument to mlfSave(). The second argument specifies the mode for writing to the file. Here "w" indicates that mlfSave() should overwrite the data. Other values include "u" to update (append) and "w4" to overwrite using V4 format.
As an example of the difference between C’s row-major array storage and MATLAB’s column-major array storage, consider a 3-by-3 matrix filled with the numbers from one to nine. 1 2 3 4 5 6 7 8 9 2-3 2 Writing Programs Notice how the numbers follow one another down the columns. If you join the end of each column to the beginning of the next, the numbers are arranged in counting order. To recreate this structure in C, you need a two-dimensional array: static double square[][3] = {{1, 4, 7}, {2, 5, 8}, {3, 6, 9}}; Notice how the numbers are specified in row-major order; the numbers in each row are contiguous.
Each of the numbered sections of code is explained in more detail below. h". This file contains the declaration of the mxArray data structure and the prototypes for all the functions in the library. h contains the definition of EXIT_SUCCESS. 2 Declare two static arrays of real numbers that are subsequently used to initialize matrices. The data in the arrays is interpreted by the MATLAB C Math Library in column-major order. The first array, real_data, stores the data for the real part of both matrices, and the second, cplx_data, stores the imaginary part of mat1.