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JPark61
8-Gravel

a name is required here

help please...

ACCEPTED SOLUTION

Accepted Solutions
LucMeekes
23-Emerald III
(To:JPark61)
15 REPLIES 15
LucMeekes
23-Emerald III
(To:JPark61)

You should NOT use global assignments ( = ), but boolean equality to define the equations in your solve block. Type [CTRL =] to get those. They show as a bold equals sign ( = ).

 

Success!
Luc

 
Werner_E
25-Diamond I
(To:JPark61)

Additional remarks:

1) You have to only use the function names without the argument parenthesis (use "C" and not "C(t)")

2) You have only 5 equations but 6 functions to solve for.

I attached new pic.

 

can you solve it please..

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

Hi,

odesys1.jpg

JPark61
8-Gravel
(To:-MFra-)

Thank you, can you attached file please?

JPark61
8-Gravel
(To:-MFra-)

and why is f(t):0.5*cosh(t)??

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

Hi,

you should provide the f (t); what I chose is a convenience function. I do not believe that Mathcad is able to determine f (t) as an unknown knowing only its initial condition.

JPark61
8-Gravel
(To:-MFra-)

thank you 

 

but the answer is below the attached file.

 

Do you know why?

 

please..

 

 

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

Hi,

If there were a further differential equation in f(t), things would change. See the following example:

odesys3.jpg

JPark61
8-Gravel
(To:-MFra-)

can you send me a file?

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

I've attached the file.

LucMeekes
23-Emerald III
(To:JPark61)

That very blurry picture shows a graph with only 4 traces. That's 4 functions, not 6.

Are you sure you have entered the complete set of ODE's, required for solving the 6 functions that you are trying to find?

 

Luc

I attached new pic.

 

can you solve it please..

LucMeekes
23-Emerald III
(To:JPark61)
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