New install: Undefined function 'isstring' for input arguments of type 'char'.

I just installed Matlab 2015 and get the following error upon starting the program:

> In matlabrc (line 228)

Undefined function 'isstring' for input arguments of type 'char'.

Error in fileparts (line 41)

if isstring(file)

The same "Undefined function 'isstring'..." appears in a dialog box whenever I try to open any script or function. However I know that I have isstring...

>> which isstring

C:\Program Files\MATLAB\R2015a\toolbox\matlab\codetools\@mtree\isstring.m % mtree method

I have 2019a installed on my machine and it works perfectly fine.

Answer 1

[Steven Lord]

I think you have a fileparts.m that you downloaded or wrote on your path ahead of the one included in MATLAB. When I opened release R2015a line 41 was:

    ind = find(file == '/'|file == '\', 1, 'last');

Check which fileparts function you're running:

which -all fileparts

Answer 2

[madhan ravi]

https://www.mathworks.com/help/matlab/ref/isstring.html#bu6eyse_seealso Release version 2016b

[Kelsey Dutta]

Then why does 2015a need it to operate correctly? I didn't modify the matlabrc file

[madhan ravi]

It’s because the function “isstring()” was introduced in 2016b you can’t use it in 2015a, I don’t know how to explain more clearly than this.