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this variable is undefined

JPark61
8-Gravel

this variable is undefined

please help me why it does not work..

11 REPLIES 11

You've not learned that all of the constraints have to come after the "given" statement?  Where is "Find"?

Go read the help files about how to set up a solve block!

 

Or are you just dumping on this forum?

how can i solve range problem.

-MFra-
21-Topaz II
(To:JPark61)

JP61-2.jpg

JPark61
8-Gravel
(To:-MFra-)

i have a question so only i want to find d.1 d.2.

 

all variables are a constant value.

 

so do I have to change d.a=0.1 not :=

 

 

-MFra-
21-Topaz II
(To:JPark61)

Hi,

the Ks are all uppercase or lowercase.....

JP61.jpg 

JPark61
8-Gravel
(To:-MFra-)

Thank you!!

 

can you send me a file??

 

why my computer does not work

-MFra-
21-Topaz II
(To:JPark61)

JP61-3.jpg

JPark61
8-Gravel
(To:-MFra-)

thank you

 

but why d.a d.b is not corret it should be 0.1 and 0.1

If ALL of your used variables have to be constant (even q=100) and you only want to vary d1 and d2m then you are asking for the impossible. There is a linear relationship between d1 and d2 and to fulfill your equation at least one of the two must be negative. So they can't be both in the range from 0 to 0.3.

HOW about this one?

 

q is not constant value.

 

 


@JPark61 wrote:

HOW about this one?

 

q is not constant value.

 

 


This is exactly what MFra already had shown quite a while ago.

If q is variable, too, you have a myriad number of solutions. And if you chose a q value for which a solution exists, there usually exist an infinite number of additional solution for d1 and d2.

So you have some additional degrees of freedom.

Some exemple:

 

q=10, d1=0.1, d2=0.121

or

q=10, d1=0.15, d2=0.071

or

q=10, d1=0.2, d2=0,021

etc.

 

Here is the formula where you can calculate d2 if q and d1 are given:

B.png

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