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Feval (COM) Execute MATLAB function in Automation server expand all in pageSynopsisIDL Method SignatureHRESULT Feval([in] BSTR functionname, [in] long nargout, [out] VARIANT* result, [in, optional] VARIANT arg1, arg2, ...)Microsoft Visual Basic ClientFeval(String functionname, long numout, arg1, arg2, ...) As ObjectMATLAB Clientresult = Feval(h,'functionName',numout,arg1,arg2,...) Descriptionresult = Feval(h,'functionName',numout,arg1,arg2,...) executes MATLAB® function functionName in the Automation server attached to h. The function name is case-sensitive. If functionName does not have input arguments, consider calling Execute instead. COM functions are available on Microsoft® Windows® systems only. Indicate the number of outputs returned by the function in a 1-by-1 double array, numout. The server returns output from the function in the cell array, result. You can specify as many as 32 input arguments to be passed to the function. These arguments follow numout in the Feval argument list. The following table shows ways to pass an argument. Passing Mechanism Description Pass the value itself To pass any numeric or character value, specify the value in the Feval argument list: a = Feval(h,'sin',1,-pi:0.01:pi);Pass a client variable To pass an argument assigned to a variable in the client, specify the variable name alone: x = -pi:0.01:pi; a = Feval(h,'sin',1,x);Reference a server variable To reference a variable defined in the server, specify the variable name followed by an equals (=) sign: PutWorkspaceData(h,'x','base',-pi:0.01:pi); a = Feval(h,'sin',1,'x=');MATLAB does not reassign the server variable. Examplesexpand all Call strcat from Visual Basic .NET ClientOpen Live ScriptThis example shows how to pass string arguments to the MATLAB strcat command using Feval. Create a Visual Basic® .NET application with the following code. type fevalPassingArguments.vbDim Matlab As Object Dim out As Object out = Nothing Matlab = CreateObject("matlab.application") Matlab.Feval("strcat",1,out,"hello"," world") Dim clistr As String clistr = " world" Matlab.Feval("strcat",1,out,"hello",clistr) Matlab.PutCharArray("srvstr","base"," world") Matlab.Feval("strcat",1,out,"hello","srvstr=") Defining Feval Return ValuesOpen Live ScriptThis example shows how to return the filepath, name, and ext arguments from the fileparts function. Feval returns data from the evaluated function in a cell array. The cell array has one row for every return value. You control the number of return values using the Feval numout argument. Create a Visual Basic .NET client with the following code. type fevalDefiningFevalReturnValues.vbDim Matlab As Object Dim out As Object Matlab = CreateObject("matlab.application") Matlab.Feval("fileparts",3,out,"d:\work\ConsoleApp.cpp") Modified Server VariablesOpen Live ScriptThis example shows how to return a modified server variable. Create a matrix, A, in the server. Reshape A.MATLAB interprets A in the expression 'A=' as a server variable name. The reshape function does not modify variable A. A is unchanged. To get the result of the reshape function, use the numout argument to assign the value to C. Create a Visual Basic .NET application with the following code. type fevalModifiedServerVariables.vbDim Matlab As Object Dim rows As Double Dim cols As Double Dim out As Object out = Nothing Dim data(7) As Double For i = 0 To 7 data(i) = i * 15 Next i Matlab = CreateObject("matlab.application") Matlab.PutWorkspaceData("A", "base", data) rows = 4 cols = 2 Matlab.Feval("reshape", 1, out, "A=", rows, cols) TipsTo display the output from Feval in the client window, assign a return value. Version HistoryIntroduced before R2006a See AlsoExecute | PutFullMatrix | GetFullMatrix | PutCharArray | GetCharArray TopicsConvert COM Types to MATLAB TypesConvert MATLAB Types to COM Types |
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