## 20 Reputation

4 years, 276 days

## Problem solved!...

I apologize for not expressing my question clearly. Your solution is exactly what I want to know!

## How to plot lines in plot3d?...

plot3dlines.mw

Thank you so much!

Another problem I encounter is how to plot lines instead of a surface in plot3d when it is integer and θt is in a range from -Pi to Pi?

## Depend on the operating system?...

You mean whether getting stuck depends on the operating system? I ran the procedure in a Win 7 computer workstation, and  staying in "Evaluating..." still happened if I didn't write the integral in the form C.

## @Carl Love I find the option! It's ...

@Carl Love I find the option! It's very kind of you!

## Thank you for your help!...

Thank you for your help! I tried the way you put forward and it is helpful!

## For checking the procedure...

I want to see the results just for checking each step of the procedure.

You are right! I should find another way to estimate the results.

By the way, could you please teach me how to display the result whose length exceeds limit of 1000000? I am curious about the way to display：）

## Unknown Variables in Definite Integral...

Unknown_Variables_in_Definite_Integral.mw

There are 3 unknown variables in the definite integral, so I use indefinite integral function and eval to get the result with no integral symbol inside.

## Stuck in Integral...

stuck_in_integral.mw

When I write integral expressions in the form A displayed in the file I uploaded,evaluating always gets stuck in calculating the integral.
When in the form B, it sometimes gets stuck. But when in the form C, it hardly gets stuck. I feel a little confused.

## How to get the approximation which is an...

Is it possible to get the approximation which is an expression containing unknown variables it, h0, theta[alpha]alpha[c]?

## Thank you so much!...

@I_Mariusz Thank you so much!

## @Kitonum @vv  I'm sorry I remo...

I'm sorry I removed several lines of codes and kept only 4 lines left. I feel sorry too that I didn't express my question clearly. p[t] is a function depending on theta  and  r. I have defined it before integrating. r[5]r[6]  and  theta[tt]  are constants I have defined too.

When calculating the integral, I found the running time of the second method is much shorter than that of the first method. I am worried whether short running time means lower precision in this situation.

## I find the line in the collspased Execut...

@acer I really appreciate your help! I find the line by following your steps!

## Thank both of you for your help!...

Though I don't know the reason why the Tutor popped up, I have solved this problem by rewriting the codes which are the trigger. Thank both of you for your patience!