How do you create a a display function that includes changing variables?

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Justin Tsui
Justin Tsui 2015-2-14
回答： Andrew Phung 2015-2-15
Is it correct to use the disp and the num2str function together and what additional formatting is needed to combine them?
For example: I want to add a changing variable into the text "An area of a circle with radius r cm equals an area of A cm^2." Where r and A are changing variables.

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回答（1 个）

Andrew Phung
Andrew Phung 2015-2-15
If you want r and A to be able to change in the display when the values are changed in the script, use brackets after the open parenthesis and before the close parenthesis. This indicates to MATLAB that there are strings and variables in your disp command.
For example:
r = 7;
A = pi*r^2;
disp(['An area of a circle with radius ', num2str(r),' cm equals an' ...
' area of ', num2str(A),' cm^2.'])
The output would be
An area of a circle with radius 7 cm equals an area of 153.938 cm^2.

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