I recently read some really well written Matlab functions written by others. I don't know what the following lines mean:
ip = inputParser;
ip.Casesensitive = false;
...
ip.addOptional('conDir', [], @ischar);
...
Basically, these are the first lines in that function. I know it means to check the input variable of function. But what exactly the third line means (ip.addOptional('conDir', [], @ischar);)? Why use function handle here?
Xinyu, go to this page:
http://www.mathworks.com/help/matlab/ref/inputparser.addoptional.html
Look for the link near the bottom entitled "Validate Optional Input". It leads to a code example which shows that the handle is a function that you provide for the parser to use to check the validity of input. In your case, the input must be a char or an error will be generated.
The [] brackets are the default value to be chosen for each valid input char that does not have a value. Therefore if any char is input that returns ischar=true but has no value, that char will be removed from the output. However I'm not sure what kind of char would have no value. Maybe an empty input string, like ''?
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