MATLAB: Am I getting the error “Invalid parameter” when trying to use setparam to modify the structure parameter in target

parameterssetparamslrtstructtuning

I have a structure 's' created in Model workspace and being used as a block parameter. Now in "setparam" command, how can I programmatically update the value of specific fields inside this structure? The goal is to update the structure “values only” and having the target reflect these modifications without having to rebuild and deploy the model again.

If I use the structure information shown in slrt explorer in "setparam", I am getting the following error:

>> setparam(tg,'blkName','/s(1).one',2)
  Invalid parameter: "blkName//s(1).one"

Where, '/s(1).one' is the value of the field "Properties -> BindingSrcPath" in slrtexplr for the corresponding structure parameter.

Best Answer

Since the structure is created as an object in Model workspace, it is a global structure parameter and to access the global structure parameters in "setparam", you should use the complete field name as follows. There is no block information necessary to use global parameters in "setparam".

>> setparam(tg,'s(1).one',2)

>> setparam(tg,'s.one',2)

Where "one" is the field name inside the structure "s1"

Related Solutions

MATLAB: How to assign a value to a field in a multi-level struct when the field name is contained in a variable

One way to do this is to use the 'subsasgn' function, which can be used to assign a value to a subscripted field. This is demonstrated in the attached example and explained below.

For this case, where there are multiple levels of the structure, create a compound indexing expression, or an array of structures, for the input parameter, 'S'. Each structure in the array must contain the type of subscript and field name. For more information on this parameter, please see the documentation page for 'subsasgn':

https://www.mathworks.com/help/matlab/ref/subsasgn.html

To do this, first split 'fieldToChange' into a cell array using 'strsplit' and splitting on the period delimiter:

>> fieldToChangeCell = strsplit(fieldToChange, '.');

Next, create an anonymous function, 'makeSParam', that takes in a field name, 'x', and places it into a structure for the 'S' parameter format of 'subsasgn':

>> makeSParam = @(x)struct('type','.','subs',x);

You can then apply this function to each cell in 'fieldToChangeCell' using 'cellfun', resulting in the compound indexing expression, 'idx':

>> idx = cellfun(makeSParam, fieldToChangeCell);

Finally, use 'subsasgn' to set the field to the desired value of 0:

>> myStruct = subsasgn(myStruct, idx, 0);

MATLAB: How to change the axis limit when I have 2 axes in the figure

You can use the "yyaxis" and "ylim" commands to set the y-limit for both axes:

>> figure

>> yyaxis left

>> plot(1:10);

>> yyaxis right

>> plot(2:2:20);

>> f = gcf;

>> yyaxis left

>> ylim(f.Children, [0 5]);

>> yyaxis right

>> ylim(f.Children, [5 10]);

Best Answer

Related Solutions

MATLAB: How to assign a value to a field in a multi-level struct when the field name is contained in a variable

MATLAB: How to change the axis limit when I have 2 axes in the figure

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