How to enforcing simbolic evaluation? - Сообщения
#1 Опубликовано: 20.02.2021 03:17:40
Even if the variable have been defined.
E.g. how to get x=(a+b）（a-b）even if a=1, b=2
E.g. how to get x=(a+b）（a-b）even if a=1, b=2
#2 Опубликовано: 20.02.2021 09:39:43
#3 Опубликовано: 20.02.2021 10:20:42
Thanks, but I want to know how to get U=(a+b )*(a-b ), even if a=1, b=2 is on the top
#4 Опубликовано: 20.02.2021 12:01:23
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 simply don't understand your request.
Read Martin handbook, to learn using Smath.
#5 Опубликовано: 20.02.2021 13:02:11
I think the only way is to delete the defintions by using Clear(a;b)= .
#6 Опубликовано: 20.02.2021 13:15:24
I think the only way is to delete the definitions by using Clear(a;= .
No need, algo is self clearing.
#7 Опубликовано: 20.02.2021 17:18:06
No need, algo is self clearing.
#8 Опубликовано: 21.02.2021 01:25:56
Even if the variable have been defined.
E.g. how to get x=(a+b）（a-b）even if a=1, b=2
Hi. As MarB says, only with Clear(a , b ) in SMath. However, it is true that in Mathcad you can hide the numeric values for a symbolic evaluation:
Best regards.
Alvaro.
#9 Опубликовано: 21.02.2021 09:24:07
I think the only way is to delete the defintions by using Clear(a;b)= .
Hi. As MarB says, only with Clear(a , b ) in SMath. However, it is true that in Mathcad you can hide the numeric values for a symbolic evaluation:
really wish Smath can perform like MathCAD
#10 Опубликовано: 21.02.2021 11:00:13
really wish Smath can perform like MathCAD
#11 Опубликовано: 21.02.2021 11:10:37
Thanks Jean.
BTW, MathCAD doesn't need to do clearance.
BTW, MathCAD doesn't need to do clearance.
#12 Опубликовано: 21.02.2021 12:00:32
BTW, 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.
#13 Опубликовано: 21.02.2021 13:27:04
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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#14 Опубликовано: 21.02.2021 13:28:15
Thanks 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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