symbolic variable - proving positive

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Gennaro Arguzzi
Gennaro Arguzzi on 30 Jun 2017
Edited: Walter Roberson on 30 Jun 2017
Hi everyone. How can I prove that a symbolic variable is positive? It is not possible to use if statement for symbolic variables.
close all
clear all
a=sym('a','positive');
if(a>0)
disp('OK')
else
disp('KO')
end
Thank you.

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Accepted Answer

Walter Roberson
Walter Roberson on 30 Jun 2017
Edited: Walter Roberson on 30 Jun 2017
syms a positive
if isAlways(a>0); disp('OK'); else disp('KO'); end
https://www.mathworks.com/help/symbolic/isalways.html

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