MATLAB: Reguarding ‘assignin’ acceptable name for variable.

assigninerrorinvalid variable nameMATLABspecific characters that give errorvariable name

Hello everybody,

Quick question, are there any specific characters that give error for 'assignin' in the variable name?

I am asking as the acceptability of a variable name looks random. In the latest trial I tried assigning a variable name as: '280617_SC_Ger' but I got an error. If I change this to 'SCGer_280617' it works.

Any Ideas?

Thank you for your answers!

%% Part of code of interest: assignin('base',sprintf('%s_Raw_Data',varname), output)

%% Error: Error using assignin Invalid variable name "280617_SC_Ger_Raw_Data" in ASSIGNIN.

Best Answer

In MATLAB the variable names never start with numbers ...it should be always a character....after character you can use number.

280617_SC_Ger this as a variable name not allowed, because it starts with number...

SCGer_280617 this as a variable name allowed, as it starts with character....

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MATLAB: How to rename an existing structure A by assigning it a name stored in a string

You can use assignin for that purpose

A = struct('X',1,'Y',2)
new_name='B';
assignin('base',new_name,A);
disp(B)

B =

struct with fields:

X: 1

Y: 2

MATLAB: Using assignin with structure elements

"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)

Best Answer

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MATLAB: How to rename an existing structure A by assigning it a name stored in a string

MATLAB: Using assignin with structure elements

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