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How to enforcing simbolic evaluation? - Сообщения
Even if the variable have been defined.
E.g. how to get x=(a+b)(a-b)even if a=1, b=2
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E.g. how to get x=(a+b)(a-b)even if a=1, b=2
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Thanks, but I want to know how to get U=(a+b )*(a-b ), even if a=1, b=2 is on the top
I think the only way is to delete the defintions by using Clear(a;b)= .
WroteI think the only way is to delete the definitions by using Clear(a;= .
No need, algo is self clearing.
Thanks Jean.
BTW, MathCAD doesn't need to do clearance.
BTW, MathCAD doesn't need to do clearance.
WroteBTW, MathCAD doesn't need to do clearance.
True for that little example. More advanced stuff needs be cleared as well.
The symbolic arrow was demanded but not implemented.
The only way is to define the variables after the expression, then you can show the expression using Clear. The other way doesn't works because when values are set before the expression, the values are stored in memory, not the variable names.
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WroteThanks Jean.
BTW, MathCAD doesn't need to do clearance.
Hi. It needs. That is the mean for a:=a and b:=b, which clear a and b only for symbolics, but not for numerics. If you want to show the symbilic value stored in x cleaning a and b after you define x, you can use line() in the definitions:

Also notice that you need to eval Clear(a, b ) = 1, if not SMath not recognize that as an instruction.
Best regards.
Alvaro.
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Davide Carpi 22.02.2021 05:37:00
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