×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Are you an
Engineering professional?
Join Eng-Tips Forums!
• Talk With Other Members
• Be Notified Of Responses
• Keyword Search
Favorite Forums
• Automated Signatures
• Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

#### Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

# Problem with my mathcad programm (iteration)

## Problem with my mathcad programm (iteration)

(OP)
Hello,
I have a problem with a programm that I have made in Mathcad. I don't know enough of Mathcad to solve it.
I have defined the equations in mathcad.
One of these equations has the form: 4/3*Pi(rt^3-r^3 (simplified). I want to know the radius at time t

I have written the following programm:
help(rt,t,r)=o(rt,t,r)-P(rt)
H(rt,t,r,)=O(rt,t,r)-P(rt)-(L*(rt-r0/r0))
V1(rt,t,r)=root(h(rt,t,r),rt)

V2:  t--> 1
rt --> r0
W --> W0
rt --> r0
while help(rt,r,t)>0.000000001
t1 --> t+1
r --> r0
W --> W0+4/3*(rt^3-r^3)
V2t-->V1(1.87*10^-5,t1,rt)
V2

at time t+1 then the function rt should be r(t+1) and r --> rt. How can I define that?

Thanks.

### RE: Problem with my mathcad programm (iteration)

Read the help file on Given-Find.  You shouldn't need a program do this, although I can't begin to tell what "this" actually is.

### RE: Problem with my mathcad programm (iteration)

(OP)
I need a programm, because I would like to know at every time t the radius. I read the help of given-find, but I think I can't use it in my programm.

I would like to know how I can define in the simplified function!
4/3 * (rt^3-r^3)
After the condition is true, that the new value of rt will be the value of r(t+1) ( which can be found with the root function )and the new value of r will be the value of the last rt. How can I define that?

Thx.

#### Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

#### Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

#### Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a partâ€™s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

# Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

• Talk To Other Members
• Notification Of Responses To Questions
• Favorite Forums One Click Access
• Keyword Search Of All Posts, And More...

Register now while it's still free!