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Code Listing by Jan Simon

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ButterParam - Fast parameters for a digital Butterworth filter

The calculation of filter parameters with BUTTER is expensive. Therefore ButterParam stores calculated parameters in a lookup-table to accelerate repeated calls with the same input.
Example:
x = rand(10000, 1); % test data
[B, A] = butter(3, 0.6);
y = filter(B, A, x);
The relation of the processing times is: BUTTER=68% / FILTER=32%!
With...



C-Mex: anyEq

This is a simple but fast check, if two arrays contain any common element.
If no common element is found, the C-Mex is 30% to 50% faster than the equivalent Matlab expression "any(X(:) == y)" and much faster...



DATAHASH - Checksum for Matlab array, struct, cell or file

Hash = DataHash(Data, Opt)
Data: Array of built-in types (U)INT8/16/32/64, SINGLE, DOUBLE (real or complex)
CHAR, LOGICAL, CELL, STRUCT (scalar or array, nested),...



Get correct case of file or folder by repeated calls of DIR

FileName = FileRealCase(FileName)
INPUT:
FileName: String, absolute path of an existing file or folder.
UNC paths are accepted.
OUTPUT:
FileName:...



WINDOWAPI - Set window properties using the Windows API

There are a lot of functions in the FEX to set the figure properties, e.g. maximized, minimized, always-on-top, level of transparency (using Java).
This submission adds 4 new...



FilterM, FiltFiltM: Fast digital filter

These functions are compatible to MATLAB's FILTER and FILTFILT commands,
but they are faster (see screenshot):
FilterM: 30%-40% of FILTER runtime
FiltFiltM: 4%-20% of FILTFILT...



UniqueFuncNames - Check uniqueness of function names

If you install a large 3rd party toolbox, the file names may interfere with other installed toolboxes. This simple funtion compares the names of all M-, P- and Mex-files found in the...



ISVALIDSYMBOL - Check string to be a valid Matlab symbol

This function is equivalent to Matlab's ISVARNAME, but accepts cell strings as input also. While the speed is comparable for strings, it is *much* faster for cell strings (see...



Compare last N chars of strings or cell strings

Input and output equal Matlab's STRNCMP/STRNCMPI, but the strings are compared from right to left.

T = strncmpr(S1, S2, N) or T = strncmpir(S1, S2, N)
INPUT:
S1, S2:...



XSum - SUM with error compensation

The accuracy of the sum of floating point numbers is limited by the truncation error. E.g. SUM([1e16, 1, -1e16]) replies 0 instead of 1 and the error of SUM(RANDN(N, 1)) is about EPS*(N / 10).