Hye, have a good day everyone..

can anyone know why I got this error? :(second_grade.mw

Error, (in dsolve/numeric/bvp/convertsys) unable to convert to an explicit first-order system

Here I have attached the file. thank you in advance :)

Hello,

Good day.

How to avoid float(undefined) for v3, v4,v5 in this problem.

Thank you in advance.

Try_for_Second_Grade_Fluid.mw

Hye, anyone know what is the float means?

and why maple cant gives the answer while the others software can?(for my problem)

hope anyone can help me because I really need this for my comparison study.

Here I have attached the file :.comparison_try1.mw

thank you in advance :)

Have a good day;

Anyone know the correct command to plot functions (For Exact Solution). Here I have attached the file:

Exact.mw

For your information, I need to plot the different values of R in the same graph. The values of R are 

R=0, 0.1, 0.2 and 0.3.

Thank you very much in advance. 

May God bless you :)

Hye,

Have a good day Sir.

can u help me how to solve my problem using the Implicit Crank Nicolson Finite different Method. I have attached the problem and what I have done in Word file. I have to modify my Equations in order to get the graphs (that is wrong actually). Can you help how to get the graphs by not change the sign of my equations?:( 

Thank you in advance.

God Bless you.