MATLAB: How to populate a custom table in a Simulink Mask

customtablemaskmaskobjectprogrammaticallysimulink

I'm looking to add a row in a custom table that’s in a mask. The name of the custom table is 'Table1', and I have the following code in one of the callbacks for a button on the mask:

Table1 = [Table1;cellstr(["a","b","c","d"])]

However, when I click on the button, I receive the following error:

Undefined function or variable Table1

How do I add a row to the custom table?

Best Answer

Please note that mask callbacks operate in the Base Workspace. The mask parameters, however, are stored in the mask workspace. This is why you see an error stating 'Undefined function or variable Table1', as the callback does not have access to the mask workspace. To work around this, you would need to obtain the mask object and access the mask parameters within:

blkName = 'add_row_to_table_callback/Subsystem';

mask = Simulink.Mask.get(blkName);

You would then need to obtain the handle to the custom table in the mask and add the row as follows: Table1 = mask.getDialogControl('Table1');

Table1.addRow("a","b","c","d");

I'm including a link to a documentation page that discusses ways to manipulate custom tables.

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Note: Table columns cannot repeat names so "Age" will only appear once, and all subsequent ones will have the value "Age_1", "Age_2"...

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The behavior you are experiencing is expected behavior. When creating a column consisting of a cell array with empty strings, these are actually treated as empty char row vectors rather than empty strings. Since these are treated as empty char row vectors, they are treated as a missing value. Because of this, there is no "group" to assign them to when passing the variable 'X' to the 'GroupingVariables' parameter, so the entire row is excluded.

A workaround would be to convert the variable 'X' from a cell array to a string array, as follows:

tblInput = table({'';'';''},[10;20;30],[40;50;60],[7, 1;8, 2;9,3]);
tblInput.Properties.VariableNames = {'X','Y','Z','Quantity'};
tblInput.X = string(tblInput.X);
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result:

 tblEmpty =
   3×5 table
     X     Y     Z     GroupCount    nansum_Quantity
     __    __    __    __________    _______________
     ""    10    40    1              8             
     ""    20    50    1             10             
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Best Answer

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