henkoegema
Posts: 13
Joined: Thu Oct 17, 2013 3:26 pm

Plot a circle.

Fri Feb 23, 2018 3:44 pm

Can somebody tell me how to plot a circle with formula x^2 +y^2 +8x + 7 = 0 in Mathematica (on a raspberry pi3 + raspbian).
Without converting the formula to x-a)^2+(y-b)^2=r^2.

I'm looking for something like: Plot[x^2 +y^2 +8x + 7 = 0, ...??.....].

Is this possible? :roll:

jardino
Posts: 121
Joined: Wed Aug 08, 2012 9:03 am
Location: Aberdeenshire, Scotland

Re: Plot a circle.

Mon Feb 26, 2018 3:08 pm

Try:
circle.jpg
circle.jpg (58.15 KiB) Viewed 3218 times
The first equals sign is important.

Have a look at the current issue of MagPi for tips.

Alan.
IT Background: Honeywell H2000 ... CA Naked Mini ... Sinclair QL ... WinTel ... Linux ... Raspberry Pi.

henkoegema
Posts: 13
Joined: Thu Oct 17, 2013 3:26 pm

Re: Plot a circle.

Mon Feb 26, 2018 4:21 pm

Thanks very much Alan. For your solution and for your tip :)
That's what I was looking for.
I'm a total beginner.( not in mathematics, but in Mathematica)

jardino
Posts: 121
Joined: Wed Aug 08, 2012 9:03 am
Location: Aberdeenshire, Scotland

Re: Plot a circle.

Mon Feb 26, 2018 8:16 pm

My pleasure.

I'm not a total beginner, but am still dipping my toes in the water.

Alan.
IT Background: Honeywell H2000 ... CA Naked Mini ... Sinclair QL ... WinTel ... Linux ... Raspberry Pi.

henkoegema
Posts: 13
Joined: Thu Oct 17, 2013 3:26 pm

Re: Plot a circle.

Mon Feb 26, 2018 8:22 pm

jardino wrote:
Mon Feb 26, 2018 8:16 pm
My pleasure.

I'm not a total beginner, but am still dipping my toes in the water.

Alan.
I'm trying to do the same.
It's nearly 50 years ago I was a math teacher.
Have forgotten a lot. So I'm refreshing my (old) brains. :lol:

User avatar
Mortimer
Posts: 908
Joined: Sun Jun 10, 2012 3:57 pm

Re: Plot a circle.

Mon Feb 26, 2018 8:32 pm

You have more than one brain! Lucky you! ;)

jardino
Posts: 121
Joined: Wed Aug 08, 2012 9:03 am
Location: Aberdeenshire, Scotland

Re: Plot a circle.

Tue Feb 27, 2018 9:34 am

My problem in learning Mathematic is not the maths (I'm fairly competent in maths), but finding a suitable goal to work to.
I bought Schaum's outline on Mathematica, but got bored doing exercise after exercise.

Alan.
IT Background: Honeywell H2000 ... CA Naked Mini ... Sinclair QL ... WinTel ... Linux ... Raspberry Pi.

henkoegema
Posts: 13
Joined: Thu Oct 17, 2013 3:26 pm

Re: Plot a circle.

Tue Feb 27, 2018 10:05 am

jardino wrote:
Tue Feb 27, 2018 9:34 am
My problem in learning Mathematic is not the maths (I'm fairly competent in maths), but finding a suitable goal to work to.
I bought Schaum's outline on Mathematica, but got bored doing exercise after exercise.

Alan.
I didn't know about the book Schaum's outline on Mathematica.
Thanks for mentioning it. It's perfect for me. :)

jardino
Posts: 121
Joined: Wed Aug 08, 2012 9:03 am
Location: Aberdeenshire, Scotland

Re: Plot a circle.

Tue Feb 27, 2018 11:12 am

Second Edition: ISBN-13:978-0-07-160828-2.

(Though Amazon don't believe in ISBN numbers.)

Alan.
IT Background: Honeywell H2000 ... CA Naked Mini ... Sinclair QL ... WinTel ... Linux ... Raspberry Pi.

Micha1982
Posts: 261
Joined: Wed Oct 03, 2012 11:18 am

Re: Plot a circle.

Sat Mar 03, 2018 1:50 pm

I am a complete math-noob...but I love mathematica (and internet :) )...it offers so many possibilities to play around and create interesting pictures and videos...:
Attachments
Pi2lq.jpg
Pi2lq.jpg (243.71 KiB) Viewed 3035 times
Alles, was schiefgehen kann, wird auch schiefgehen.

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