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How do I let a user choose what variable they want to assign a value to?

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I am making a program where I would like it to display a list of variable names (already created inside the program) and then let the user decide which one variable they want to assign a value to (either by typing the name of the variable or by typing in some pre-set command) and then input the value to be assigned to that variable.
(To give some background this is for a unit converter program where the user would, for instance, type "feet" and then e.g. "3" and it would return what 3 feet is in metres, inches, miles, yards etc; or they could type "metres" and then e.g. "5" and it would return this value in feed, inches etc).

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Image Analyst
Image Analyst il 27 Dic 2018
Modificato: Image Analyst il 27 Dic 2018
I would put those variable names into a drop down list (what Mathworks calls a popup).
Then the user can select one, and in the popup callback, you can execute the proper code for that selection using a switch or if/else block.
Or perhaps less user friendly, you could use the menu() function and execute the appropriate code for whatever button number they clicked on.

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madhan ravi
madhan ravi il 27 Dic 2018
Modificato: madhan ravi il 27 Dic 2018
There's already one requires symbolic math toolbox :
Use input() or just use inputdlg() to input a value.

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