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MLEvalString

Evaluate MATLAB command in MATLAB

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Syntax

= MLEvalString(command)
MLEvalString command
err = MLEvalString(command)

Description

example

= MLEvalString(command) specifies the MATLAB® command for evaluation in the MATLAB workspace. Use this syntax when working in a worksheet cell.

example

MLEvalString command works in a VBA macro.

example

err = MLEvalString(command) returns the execution status when executing MLEvalString in a VBA macro.

Examples

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Enter the variable a into cell A1. Enter the numbers 1 through 5 into the range of cells from B1 through F1.

Assign the range of cells to variable a in MATLAB using MLPutMatrix. Enter this text in cell A3. 

=MLPutMatrix(A1,B1:F1)

Worksheet cell A3 contains the entered text.

Use diag to create a matrix b, containing a diagonal using the five numbers in variable a. Enter this text in cell A5. 

=MLEvalString("b = diag(a);")

Cell A3 contains 0, which indicates the successful execution of the MLPutMatrix function.

Retrieve matrix b from MATLAB into Excel® cell A9. Enter this text in cell A7. 

=MLGetMatrix("b","A9")

The matrix with the diagonal appears in cells A9 through E13.

Cell A7 contains 0, which indicates the successful execution of the MLGetMatrix function.

Enter the variable a into cell A1. Enter the numbers 1 through 5 into the range of cells from B1 through F1.

Click the Developer tab in Microsoft® Excel, and then click Visual Basic. The Visual Basic® Editor window opens.

Insert a new module and enter this VBA code into the Code section of the window. This sample code assumes a macro named Diagonal. For details on working with modules, see Excel Help.

Sub Diagonal()

    MLPutMatrix "a", Range("B1:F1")
    MLEvalString "b = diag(a);"
    MLGetMatrix "b", "A3"
    MatlabRequest

End Sub

Run the macro by clicking Run Sub/UserForm (F5). The diagonal matrix appears in cells A3 through E7. For details on running macros, see Excel Help.

Worksheet cell A1 contains the variable a, cells B1 through F1 contain numbers 1 through 5, and cells A3 through E7 contain the diagonal matrix.

Enter the variable a into cell A1. Enter the numbers 1 through 5 into the range of cells from B1 through F1.

Click the Developer tab in Microsoft Excel, and then click Visual Basic. The Visual Basic Editor window opens.

Insert a new module and enter this invalid VBA code into the Code section of the window. This sample code assumes a macro named Diagonal. For details on working with modules, see Excel Help.

Sub Diagonal()

    Dim err As Variant

    MLPutMatrix "a", Range("B1:F1")
    err = MLEvalString("b = diag(2a);") 'Invalid code
    
    If err <> 0 Then
        MsgBox err
    End If

    MLGetMatrix "b", "A3"
    MatlabRequest

End Sub

Run the macro by clicking Run Sub/UserForm in the VBA toolbar. For details on running macros, see Excel Help.

This Spreadsheet Link™ error displays: #COMMAND!. To display MATLAB errors, see MLShowMatlabErrors.

Input Arguments

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MATLAB command to evaluate, specified as a string. Enclose the string in double quotes. Or, enter the string in a cell without quotes and enter the corresponding cell reference without quotes as the input argument.

Example: "sum"

Example: A1

Output Arguments

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Execution status, returned as a string or number. If MLEvalString fails, then err is a string containing an error code or error message. Otherwise, the command executes successfully and err is 0.

By default when MLEvalString fails, err contains a standard Spreadsheet Link error, such as #COMMAND. To return MATLAB errors, execute MLShowMatlabErrors.

Tips

  • The specified action alters only the MATLAB workspace and has no effect on the Microsoft Excel workspace.

  • To work with VBA code in Excel with Spreadsheet Link, you must enable Spreadsheet Link as a reference in the Microsoft Visual Basic Editor. For details, see Installation.

Version History

Introduced before R2006a

See Also

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