MATLAB: Does using REFRESHDATA in the stand-alone application compiled with MATLAB Compiler 4.4 (R2xxxx) cause a run-time error

basecallerMATLABworkspace

When I use REFRESHDATA in my stand-alone application compiled with MATLAB compiler 4.4, I receive the following error at run-time:

 ??? Error using ==> refreshdata
 Could not refresh ZData from 'z'.
 Error in ==> myfile at 7
 refreshdata(h);
 >> myfile
 ??? Error using ==> refreshdata
 Could not refresh ZData from 'z'.
 Error in ==> myfile at 8
 refreshdata(h);

Reproduction Steps:

Note: You do not need to create a stand-alone application; simply calling REFRESHDATA in a MATLAB function returns the error. For example, if you put the code from the documentation into a function:

function myfile()
z = peaks(5);
[c h] = contour(z,'ZDataSource','z');
drawnow
pause(3) % Wait 3 seconds and the graph will update
z = peaks(20);
drawnow;
refreshdata(h);

Best Answer

REFRESHDATA is supported by the MATLAB compiler. The issue is not due to the usage of REFRESHDATA in a stand-alone application since it is reproducible in a MATLAB function. The issue that you are facing is probably due to the usage of the following syntax:

refreshdata(handle);

This defaults to the base MATLAB workspace where the variable will not be found since you are calling REFRESHDATA from a function. The correct syntax to use in this case is:

refreshdata(handle,'caller');

This behavior is expected and can be found in the documentation for REFRESHDATA by typing:

doc refreshdata

Related Solutions

MATLAB: Do I get warnings when compiling FMINCON and LSQNONLIN in a stand-alone application? Why does FMINCON depend on all these handle graphics functions

The Optimization Toolbox allows optimization options that graph the result of running the routine. These options use graphics plot commands to show the results. That is why compiling lsqnonlin.m will result in references to these many functions.

There are two recommended ways to work around this limitation:

1. Use the C/C++ graphics library (preferred)

2. Stub out the calls to the MATLAB files involved with the graphics library and disable the associated warning messages.

In order to accomplish the second option, you will need to create a directory containing MATLAB files that are stub versions of the functions in .../toolbox/matlab/graphics, .../toolbox/matlab/graph2d, etc. The MATLAB compiler must be told to examine this directory containing the stub files prior to finding the directory with the actual handle graphics functions in it.

It works like this:

1. Create a directory to contain the stub MATLAB files (hgstubs for example)

2. Populate it with versions of the MATLAB Files from the graphics toolbox with the following definition:

   function [varargout] = close( varargin )
     error('Graphics functions are not compiled into this application');
   These functions will cause an error if they are called in the compiler-generated code.

3. Use the following compilation command from within MATLAB:

mcc -I hgstubs -mvg lsqnonlin -w ...
disable:using_graphics_function

This will cause lsqnonlin to be compiled to produce an error if any of the handle graphics functions are called.

4. In order to use this trick when compiling from the DOS or Unix Shell prompt, you must ensure that the hgstubs directory is on the compiler path prior to the directories containing the graphics functions in MATLAB.

   - You must NOT use a saved path in your preferences directory
   - You must manually specify the saved path file on the command line after the hgstubs directory.
mcc -I hgstubs -B <mysavedpathfile> -mvg lsqnonlin -w disable:using_graphics_function

5. The specific graphics library functions that will need to be stubbed out for lsqnonlin are:

close, subplot, xlabel, ylabel, legend, and title

MATLAB: How to compile the simple GUI or graphical application using the MATLAB Compiler

This issue has been fixed in the MATLAB Compiler 4.0 (R14). If you are using a previous version, please read the following:

The correct way to compile an MATLAB file that uses graphics is to specify that you want to include the graphics libraries when compiling. This is done using the '-B sgl' flag with the MCC command (or '-B sglcpp' for C++):

mcc -B sgl myGuiApp

Although the warning messages above mention object-oriented programming, the correct problem is the missing graphics libraries in this case.

Best Answer

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MATLAB: Do I get warnings when compiling FMINCON and LSQNONLIN in a stand-alone application? Why does FMINCON depend on all these handle graphics functions

MATLAB: How to compile the simple GUI or graphical application using the MATLAB Compiler

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