C# - Keep in memory variables between calling 2 different matlab routines

Is it possible to keep in memory variables used in a 1st matlab routine called by C#, when I call a 2nd matlab routine?

For example if I have in my C# application

matlabroutine1(); matlabroutine2();

and matlabroutine1 allocates a variable value1, when I call matlabroutine2 value1 is available?

Answer 1

[Walter Roberson]

This may be a situation in which using global variables would be appropriate.

Answer 2

[owr]

What you are looking for is "setmcruserdata" and "getmcruserdata". Im assuming you are using the Builder NE. If so, also make sure that "matlabroutine1" and "matlabroutine2" are both methods in the same deployed C# class. These methods will share a common workspace in the MCR that will enable them to share data in the way you want.

[owr]

Ok - the docs are not great on this so here is an example of how I do it. Lets say "matlabroutine1" creates a variable that "matlabroutine2" needs to use that you dont want to pass back and store in C# (I do this with MATLAB objects all the time). What you need is a common variable name that is passed into both methods from C#

In ML, your code can look something like this:

function matlabroutine1(varName)

% The variable name doesnt matter within the function

varValue = <your specific formula>

% Save it off using the input variable name

setmcruserdata(varName,varValue)

function matlabroutine2(varName)

% Get the saved variable using the input varName

varValue = getmcruserdata(varName);

% Do whatever you need with it...

[alorenzom]

Dear

I tried the following project:

---------------------------------------------

I builded this

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// Class1.cs

namespace Interfaccia

{

public interface Class1

{

void dammiA(out int Num,string varNm);

void Aggiungi(string varNm);

}

}

---------------------------------------------

---------------------------------------------

then I builded this

---------------------------------------------

% Aggiungi.m

function Aggiungi(varNm)

value = 10;

setmcruserdata(varNm, value);

end

% dammiA.m

function b = dammiA(varNm)

b = getmcruserdata(varNm);

end

---------------------------------------------

---------------------------------------------

then I builded this

---------------------------------------------

namespace Solutore

{

public partial class MainWindow : Window

{

public MainWindow()

{

InitializeComponent();

}

private void button1_Click(object sender, RoutedEventArgs e)

{

Class1 Calcolo = new Calcolo.Class1Class1();

int b;

string varNm ;

varNm = "varNm";

Calcolo.Aggiungi(varNm);

Calcolo.dammiA(out b, varNm);

}

}

}

---------------------------------------------

---------------------------------------------

and after executing button1_Click I got at "Calcolo.dammiA(out b, varNm);"

ArgumentException non è stata gestita

Cannot convert MWArray to requested type

[owr]

You have the correct idea with the .m functions you wrote. I think the issue is in how you are calling it in C#:

Calcolo.dammiA(out b, varNm);

You declared "b" to be an int, all outputs from deployed MATLAB functions need to be some sort of "MWArray". It looks like you are trying to use an interface wrapper with "Class1". I would leave this out until you are comfortable working with MWArray's. I would expect that you will have to do something more like this:

MWArray[] mlout = Calcolo.dammiA(1, varNm); // "1" means you are only expecting one output.

int b = (int)(MWNumericArray)mlout[0] // Since you know the first(only) output is an integer

The documentation for Builder NE has many examples of how to work with MWArrays.

Good luck!