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duc nguyen | 6 Aug 15:51
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line-( circle / ) lens intersection .

Please let me known how to use Graph to
solve this problem . Thank you .
 
 
1. Let's R1 and R2 be the radii of 2 circles , equal to 1 .
 
2. the centers of the 2 circles are on 2 perpendicular axis x, y ,     at x=1, y=0 and x=0 and y=1 . 
 
3. the 2 radii have an common initial point at x=1 , y=1 .
 
4. rotate the 2 radii clockwise with constant speed .
 
5. one of the 2 radii will generate an arc of 1/4 of a
circumference , from x=1 , y=1 to x=0 , y=0 .
 
6. the other radius will generate an other arc of 1/4
of a circumference , from x=1 , y=1 to x=0 , y=2 .
 
 
7. From x=0 , y=2 to x=0 , y=0 , on the second circle ,
   
a curve having the form of a lens ( left side half curve / upper half curve ) 
 
could be generated as a curve of rolling contact of
 
the 1st radius and the left side ( 2 quadrants ) of
the 2nd circle .
 
8. Compute and graph the left side curve / upper half curve of the lens .

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Ivan Johansen | 8 Aug 20:10
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Re: line-( circle / ) lens intersection .

duc nguyen wrote:
> Please let me known how to use Graph to
> solve this problem . Thank you .

Use Function|Insert function, choose Parametric Function as Function 
type and enter the formula for the function. For a circle you can use 
x(t)=r*cos(t)+a, y(t)=r*sin(t)+b to plot a circle with radius r and 
center at (a,b).

Best regards
Ivan Johansen

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Tom Gettys | 10 Aug 00:45
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Re: CNN Alerts: My Custom Alert

ATTENTION!!!  There is a rather innocent looking virus going around with the CNN logo, so I strongly suspect this is it.  The following is the message broadcast at my school about this:

 

Please excuse the interruption, but the IT dept. needs to alert you to a new computer threat being received via incoming email messages this morning.

The following sample message is PORTION OF THE MESSAGE BEING RECEIVED TODAY. If you have received a similar message in your Inbox, DO NOT click on any of the links.

Similar messages from CNN.com (and potential other news services) that you may have received recently are clever forgeries and the links are actually to websites that may contain dangerous "malware" that could infect your computer.

 

Tom Gettys

2929 Warren Street

Eugene, Oregon97405

(541) 683-1940

 

To dream of the person you would like to be

is to waste the person you are.

 

From: graph-support-bounces <at> lists.sourceforge.net [mailto:graph-support-bounces <at> lists.sourceforge.net] On Behalf Of CNN Alerts
Sent: Saturday, August 09, 2008 2:15 PM
To: graph-support <at> lists.sourceforge.net
Subject: [Graph-support] CNN Alerts: My Custom Alert

 

Alert Name: My Custom Alert

Intel to launch takeover bid for AMD
Sat, 9 Aug 2008 18:14:29 -0300

FULL STORY

 

You have agreed to receive this email from CNN.com as a result of your CNN.com preference settings.
To manage your settings click here.
To alter your alert criteria or frequency or to unsubscribe from receiving custom email alerts, click here.

Cable News Network. One CNNCenter, Atlanta, Georgia 30303
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A Time Warner Company
All Rights Reserved.
View our privacy policy and terms.

 

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Jan Dvorak | 23 Aug 18:21
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crash when switching from logarithmic

Hello,
Graph (4.3) crashes when the axes are switched from logarithmic to linear (both
at the same time) and square zoom is on.
The error message says "log(-10,0):domain error" where (-10,10) is the default
range for x and y. 
Works fine when square zoom is off.

Thanks,
John Dvorak

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Ivan Johansen | 25 Aug 01:07
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Re: crash when switching from logarithmic

Jan Dvorak wrote:
> Graph (4.3) crashes when the axes are switched from logarithmic to linear (both
> at the same time) and square zoom is on.
> The error message says "log(-10,0):domain error" where (-10,10) is the default
> range for x and y. 
> Works fine when square zoom is off.

Thank you for notifying me about this problem. I have now fixed it in 
the beta version of Graph 4.4 at http://padowan.dk/graph/DownloadBeta.php

Best regards
Ivan Johansen

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Gmane