If the input is a negative number, generate an error. Otherwise, return the number.
Number of toolboxes?
Convert a vector into a number
Spot the outlier
Generate pi using logarithm
find the maximum element of the matrix
Get factory-defined property values
Create an 8-color version of an image
Assign matrix rows/columns to separate variables
Determine which fields have been modified in a structure
Create cell array of strings
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