Get variables from my Matlab workspace

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Moataz Aly
Moataz Aly 2019-10-28
评论： Ajith Thomas 2019-11-4
I am using C mex S-function to Generate a Simulink Block called sFct_Dyn_Block by the following mex file:
mex -D__SIM_MODE__ src_Dyn_Block\sFct_Dyn_Block.c src_Dyn_Block\Dyn_Block.c src_Dyn_Block\hyd_dyn.c src_Dyn_Block\hst.c
The sequence of my code:
  1. I run a matlab file called input_users.m to collect some user inputs
  2. the user inputs are now in matlab workspace
  3. when I run my mex class I need to pass these variables some how from matlab workspace to my hyd_dyn.c class
  4. finally when I run my simulink model the output of sFct_Dyn_Block should change every time according to the userinputs
I can't pass the userinput variables from matlab workspace to my hyd_dyn.c class, I tried everything for 4 days but nothing workout.
I appreciate any help !!

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Thomas Satterly
Thomas Satterly 2019-10-28
You should be using either inports or parameters to pass data from Matlab to you Simulink block. The "From Workspace" block works easily enough (you can just type in the name of your workspace variable). S-function parameters can be set in the Block Parameters window of the S-function block (double click on the block) and require a little more C code to set up properly, but is still easy enough. Does your S-function currently use any inputs?
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Thomas Satterly
Thomas Satterly 2019-10-28
I think you want to reference the workspace "caller" instead of base, as I beleive the "base" workspace references the Simulink model workspace, wheras the caller would be the Matlab command line
Moataz Aly
Moataz Aly 2019-10-29
编辑：Moataz Aly 2019-10-29
It should be something like this !
const mxArray *array_ptr;
double *hyd_kannal_daten;
array_ptr = mexGetVariable("base", "hyd_kannal_daten");
if (array_ptr == NULL){
mexPrintf("Could not get the variable named hyd_kannal_daten from matlab Workspace.\n");}
hyd_kannal_daten = mxGetPr(array_ptr);
The function returns a pointer to the first mxDouble element of the real part of the data.
mexPrintf("Value of user choice [hyd_kannal_daten]=%f\n", hyd_kannal_daten[0]);
I think this should be the logic required, Thanks for your help !!

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