"Attempted to access an element that was not defined before use" - MATLAB Coder

I am trying to convert my A* algorithm code in MATLAB to C using the MATLAB Coder application. My MATLAB code however uses cell arrays and I have been trying to keep them while removing functions or variables like cell2mat that cannot be converted. I am left with one error that says a cell array is not defined. After checking through it, it has the actual indexes declared but nothing is defined in them. I cannot find the reason why it is doing it, and I do not know how to fix it.

astar_o.m is the original file which had a file that had to be converted into a matrix to find the map. astar.m is the file I am trying to convert into C and it takes in a matrix straightaway of the map.

If anyone can shed light, thanks.

Answer 1

[Walter Roberson]

You did not declare Searchable to be varsize, so it is only 1 x 1, but you try to add multiple entries on the fly.

Answer 2

[upol]

how to define varsize?

[Walter Roberson]

https://www.mathworks.com/help/fixedpoint/ug/defining-variable-size-data-for-code-generation.html

Answer 3

[upol]

I am trying to convert this simple code into excutable using matlab coder.

function y = hello_world 
%#codegen 
y = 'Hello World!'; 

converting to source code C works but when i change the build type to Executable

It gives me this error:

Build error: C compiler produced errors. See the Build Log for further details.

C:/PROGRA~3/MATLAB/SUPPOR~1/R2018b/3P778C~1.INS/MINGW_~1.INS/bin/../lib/gcc/x86_64-w64-mingw32/6.3.0/../../../../x86_64-w64-mingw32/lib/../lib\libmingw32.a(lib64_libmingw32_a-crt0_c.o):crt0_c.c:(.text.startup+0x2e): undefined reference to `WinMain'

collect2.exe: error: ld returned 1 exit status

gmake: *** [C:/dummy/hello_world.exe] Error 1

The make command returned an error of 2

'An_error_occurred_during_the_call_to_make' is not recognized as an internal or external command,

operable program or batch file.

Error(s) encountered while building "hello_world":

### Failed to generate all binary outputs.