File Exchange

## Matlab-general

version 1.0.0 (4.04 KB) by
This repository collects matlab functions which belong to no specific topic. It collects functions which are used in general.

Updated 30 Apr 2019

# Matlab-general
This repository collects matlab functions which belong to no specific
topic. It collects functions which are used in *general*.

It currently includes the following functions:
* **count2log10**: a helper function to scale counting matrices using log10; it further delets all 0 entries and replaces it with eps.
* **isEven**: a helper function which checks if a numbe is even.
* **isOdd**: a helper function which checks if a numbe is odd.
* **StringMustBeMember**: checks if a sttring is within a list of strings

This toolbox is also mirrored to the [Matlab File Exchange](https://de.mathworks.com/matlabcentral/profile/authors/3965795-roland).
It is heavily used in the [mdtsToolbox](https://github.com/RolandRitt/Matlab-mdtsToolbox).

### Cite As

Roland (2020). Matlab-general (https://github.com/RolandRitt/Matlab-general), GitHub. Retrieved .

Jan

All the function StrMustBeMember does is calling mustBeMember. Then the potentially occurring error is caught and a new exception is created. On success TRUE is replied, on failure and error is thrown. So why not calling mustBeMember directly?

Stephen Cobeldick

The functions isEven and isOdd are complex and slow: two intermediate variables, one output variable, totally superfluous FIND. They also return numeric outputs rather than logical outputs. Ouch.

The standard MATLAB code for checking for odd/even integer values is simpler and more efficient:
mod(A,2)==1 % is odd
mod(A,2)==0 % is even

The function count2log10 is of questionable numeric value: it arbitrarily changes some values into other values, e.g.:
>> V = 0:0.25:2
V =
0.00000 0.25000 0.50000 0.75000 1.00000 1.25000 1.50000 1.75000 2.00000
>> count2log10(V) % note 5th element is EPS, not ZERO.
ans =
0.00000 -0.60206 -0.30103 -0.12494 0.00000 0.09691 0.17609 0.24304 0.30103
>> log10(V) % correct values (note -Inf and ZERO values).
ans =
-Inf -0.60206 -0.30103 -0.12494 0.00000 0.09691 0.17609 0.24304 0.30103

There is no explanation given as to *why* some values deserve to be changed arbitrarily. It certainly does not make much sense for numeric calculations.

##### MATLAB Release Compatibility
Created with R2018b
Compatible with any release
##### Platform Compatibility
Windows macOS Linux