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Definition of Variables with several "if".
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Joined: 31/12/2021(UTC)
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Is it possible to define a variable, that depends on an other variable.
I want to define a variable like: "Mpa".
The "Mpa" is 400N/mm^2, if the variable "Diameter" is 12mm.
If the variable "Diameter" is 14mm, "MPA" should be 300N/mm^2.
If the variable "Diameter" is 16mm, "MPA" should be 250/mm^2.
...
At the end, the list is about 15 different possibilities.
I came from Mathcad. Mathcad has the option "add Line". With this, you can add as much "if"-Lines as you wand.
Is there a possibility to do this in Smath Studio also?
Thank you.
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 Rank: Advanced Member Groups: Registered
Joined: 23/07/2013(UTC) Posts: 1,126  Was thanked: 507 time(s) in 338 post(s)
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If I understood correct, what you need is cases() function.
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Joined: 14/09/2013(UTC) Posts: 90  Was thanked: 24 time(s) in 16 post(s)
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Please note that cases() function is not directly included in SMath "core" functions; you will find it after installing a plug-in called Custom Functions.
You can find it in SMath extension manager.
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Joined: 04/07/2015(UTC) Posts: 6,866  Was thanked: 981 time(s) in 809 post(s)
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Originally Posted by: MathUser123  I came from Mathcad. Mathcad has the option "add Line". With this, you can add as much "if"-Lines as you wand.
Is there a possibility to do this in Smath Studio also?
Lot more pro in Smath ... coma twice on any place holder. ![Cases [if_otherwise] coma twice.PNG](/forum/resource.ashx?a=42836&b=2)
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Rank: Advanced Member Groups: Registered
Joined: 23/07/2013(UTC) Posts: 1,126 Was thanked: 507 time(s) in 338 post(s)
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You can make cases() as a function. This will make mpa value easily calculated. Regards 
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Joined: 04/07/2015(UTC) Posts: 6,866 Was thanked: 981 time(s) in 809 post(s)
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Inspired from overlord. 
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Rank: Advanced Member Groups: Registered
Joined: 23/07/2013(UTC) Posts: 1,126 Was thanked: 507 time(s) in 338 post(s)
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Just a reminder, you should watch for order in cases. Once one if condition is provided, below won't be regarded. Regards 
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Rank: Newbie
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Hey, thank you all. You are awesome. It worked. Thanks for your detailed inputs.
Regards…
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 Rank: Advanced Member Groups: Registered
Joined: 14/10/2015(UTC)
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Hello For this type of project, I try to fit the data to a curve and find its equation, and thus calculate any value in the specified range. Although in this case, the values given are very few, as an example I annex the corresponding calculation.   Define_a_Variable_Ajust_by_Last_Square.sm (59kb) downloaded 52 time(s).Best Regards Carlos
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Hola Carlos, best 2022. Pretty clean Quadratic fit ! Take care ... Jean Quadratic fit.sm (15kb) downloaded 17 time(s).
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Rank: Advanced Member Groups: Registered
Joined: 14/10/2015(UTC)
Posts: 308
Was thanked: 77 time(s) in 58 post(s)
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Hola Jean
Feliz y Prospero 2022
Nice quadratic fit, thanks
Cuidate mucho
Carlos
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