Using assignin with structure elements

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John F
John F 2020-1-4
评论： John F 2020-1-6
Hi,
I have created a script where I want to assign a character string to an element in a structure, namely the "description" field of Simulink data objects in the workspace. I have seutp a loop to assign each using the following command:
assignin('base',myVar,myDes)
myVar is the variable as a string (e.g., 'name.Description'). myDes is the character string to be assigned as a description. When I run the command, I get this error:
Error using assignin
Invalid variable name "name.Description" in
ASSIGNIN.
Error in AddDescriptionToDDEntries (line 15)
assignin('base',myVar,myDes)
If I perform the assignment at the command line using an "=", it works fine. What am I missing?
Thanks!

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per isakson
per isakson 2020-1-4
"What am I missing?" assignin() cannot assign to a field of a structure.
It's possible to do it with evalin(). Compare the note of the documentation on assignin()
To assign values to specific elements of an array, use the evalin function.
evalin('base','X(3:5) = -1')
I assume that you read TUTORIAL: Why Variables Should Not Be Named Dynamically (eval)
  2 个评论
Walter Roberson
Walter Roberson 2020-1-4
You can evalin to get the current structure, modify the local copy, then assignin the entire structure from the modified version.
John F
John F 2020-1-6
Thanks folks!. The combo of these two helped a lot.

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