How to get 'type' of a variable in matlab?

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Andrew
Andrew el 15 de Nov. de 2013
Comentada: ANTONIO RUBIA el 8 de Mzo. de 2021
Hi, We declare many types of variables in matlab such as double, string, symbolic etc. How to get type of a variable?

Respuesta aceptada

Sean de Wolski
Sean de Wolski el 15 de Nov. de 2013
Editada: MathWorks Support Team el 27 de Nov. de 2018
To get the data type, or class, of a variable, use the “class” function.
x = 100;
class(x)
To determine if a variable has a specified data type, use the “isa” function.
tf = isa(x,'double')
For a list of functions that determine if variables have specific attributes, see “is*”.
You also can use the “validateattributes” function, which can validate many classes at once easily.

Más respuestas (1)

Azzi Abdelmalek
Azzi Abdelmalek el 15 de Nov. de 2013
class(your_variable)
  9 comentarios
Steven Lord
Steven Lord el 8 de Mzo. de 2021
How are you planning to use that information? There are ways to get access to this information (the whos function is one) but depending what you want to do with that information there may be better / safer alternatives.
ANTONIO RUBIA
ANTONIO RUBIA el 8 de Mzo. de 2021
Dear Steven, thank you for your constructive and useful answer. My plan is to use that information in an app environment similar to the Import Data functionality of the Econometric Modeler app. The point is to allow the user to import data from the workspace into the main app by selecting the variables listed on a table by rows, with columns showing different information (name, class, size, etc.).
The function whos you suggested does the job. In my case, something like:
info = evalin('base', 'whos')
collects all the information meant to be reported in the selection table and can be processed programatically in a function. Your suggestion should help clarify M. Sivakumar's earlier question too.
This is already a valid solution, but in case you may have better /safer alternatives, I would definitively love to know more about them.
Thanks !

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