Sign Up

Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.

Have an account? Sign In

Have an account? Sign In Now

Sign In

Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.

Sign Up Here

Forgot Password?

Don't have account, Sign Up Here

Forgot Password

Lost your password? Please enter your email address. You will receive a link and will create a new password via email.

Have an account? Sign In Now

You must login to ask question.(5)

Forgot Password?

Need An Account, Sign Up Here

Please briefly explain why you feel this question should be reported.

Please briefly explain why you feel this answer should be reported.

Please briefly explain why you feel this user should be reported.

Sign InSign Up

ITtutoria

ITtutoria Logo ITtutoria Logo

ITtutoria Navigation

  • Python
  • Java
  • Reactjs
  • JavaScript
  • R
  • PySpark
  • MYSQL
  • Pandas
  • QA
  • C++
Ask A Question

Mobile menu

Close
Ask a Question
  • Home
  • Python
  • Science
  • Java
  • JavaScript
  • Reactjs
  • Nodejs
  • Tools
  • QA
Home/ Questions/Fixing the error: runtimewarning: invalid value encountered in true_divide
Next
Answered
Louise Barbe
  • 33
Louise Barbe
Asked: May 11, 20222022-05-11T18:45:40+00:00 2022-05-11T18:45:40+00:00In: Programs

Fixing the error: runtimewarning: invalid value encountered in true_divide

  • 33

. Advertisement .

..3..

. Advertisement .

..4..

This is the program I run:

from pylab import*
 from math import*
 m=0.1
 Lo=1
 tt=30
 k=200
 t=20
 g=9.81
 dt=0.01
 n=int((ceil(t/dt)))
 km=k/m
 r0=[-5,5*sqrt(3)]
 v0=[-5,5*sqrt(3)]
 a=zeros((n,2))
 r=zeros((n,2))
 v=zeros((n,2))
 t=zeros((n,2))
 r[1,:]=r0
 v[1,:]=v0
 for i in range(n-1):
  rr=dot(r[i,:],r[i,:])**0.5
  a=-g+km*cos(tt)*(rr-L0)*r[i,:]/rr
  v[i+1,:]=v[i,:]+a*dt
  r[i+1,:]=r[i,:]+v[i+1,:]*dt
  t[i+1]=t[i]+dt
 
  #print norm(r[i,:])
 
 plot(r[:,0],r[:,1])
 xlim(-100,100)
 ylim(-100,100)
 xlabel('x [m]')
 ylabel('y [m]')
 
 show()

After I run, it returns an error

a=-g+km*cos(tt)*(rr-L0)*r[i,:]/rr
 RuntimeWarning: invalid value encountered in divide

Does anyone have any suggestions for my problem: runtimewarning: invalid value encountered in true_divide in the programs. How to correct it?

python-2.7
  • 3 3 Answers
  • 72 Views
  • 0 Followers
  • 0
Answer
Share
  • Facebook
  • Report

3 Answers

  • Voted
  • Oldest
  • Recent
  • Random
  1. Best Answer
    hillszoie
    2022-05-23T06:44:33+00:00Added an answer on May 23, 2022 at 6:44 am

    I have some recommendation for your problem

    Array2 = np.array([3, 2, 0])
    # Supress/hide the warning
    np.seterr(invalid='ignore')
    # divide the values in Array1 by the
    # values in Array2
    np.divide(Array1, Array2)

    The output is:

    array([ 2., 1., nan])
    • 21
    • Reply
    • Share
      Share
      • Share on Facebook
      • Share on Twitter
      • Share on LinkedIn
      • Share on WhatsApp
      • Report
  2. Lou Renault
    2022-05-11T18:45:44+00:00Added an answer on May 11, 2022 at 6:45 pm

    Divide rr, which could be 0.0. You can check rr to see if it is zero.

    • 6
    • Reply
    • Share
      Share
      • Share on Facebook
      • Share on Twitter
      • Share on LinkedIn
      • Share on WhatsApp
      • Report
  3. ferneparker
    2022-07-12T06:29:02+00:00Added an answer on July 12, 2022 at 6:29 am

    Your code may be trying to “divide zero” or “divide NaN”. You can do this if you’re aware of it and don’t mind it.

    import numpy as np
    np.seterr(divide='ignore', invalid='ignore')
    • 0
    • Reply
    • Share
      Share
      • Share on Facebook
      • Share on Twitter
      • Share on LinkedIn
      • Share on WhatsApp
      • Report

Leave an answer
Cancel reply

You must login to add an answer.

Forgot Password?

Need An Account, Sign Up Here

Sidebar

Ask A Question
  • How to Split String by space in C++
  • How To Convert A Pandas DataFrame Column To A List
  • How to Replace Multiple Characters in A String in Python?
  • How To Remove Special Characters From String Python

Explore

  • Home
  • Tutorial

Footer

ITtutoria

ITtutoria

This website is user friendly and will facilitate transferring knowledge. It would be useful for a self-initiated learning process.

@ ITTutoria Co Ltd.

Tutorial

  • Home
  • Python
  • Science
  • Java
  • JavaScript
  • Reactjs
  • Nodejs
  • Tools
  • QA

Legal Stuff

  • About Us
  • Terms of Use
  • Privacy Policy
  • Contact Us

DMCA.com Protection Status

Help

  • Knowledge Base
  • Support

Follow

© 2022 Ittutoria. All Rights Reserved.

Insert/edit link

Enter the destination URL

Or link to existing content

    No search term specified. Showing recent items. Search or use up and down arrow keys to select an item.