Re: Problem with Vista

Andres Ramirez wrote:
> I use to work with this great program, but now that i have migrate to vista,
> despite i have a good processor and video card (core2duo, nvidia8400, 2G RAM)
> there`s a problem with the animation command. There's a procesing (aparently) of
> the data for the animation (a bar is filled with blue color), but just in the
> moment at wich you should expect the window with the animation, a message box
> appear. The box say: "The specified file can't be played on the specified MCI
> device. The file may be corrupt, not in the correct format, or no fil."

I have now been looking into this problem that prevents the animation 
feature from working under Windows Vista, and it turns out that it is a 
problem in Windows Vista in Video for Windows. Microsoft has been aware 
of the problem since October 2006.

Fortunately the problem has been fixed in Windows Vista Hotfix KB938979, 
which currently is in beta test. I expect it to be available on Windows 
Update within a few weeks.

Best regards
Ivan Johansen

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problem with version 4.2

Dear all,
why the software is not able to calculate the area from 2 to 100000 of (ln
x) / sqrt(x^3) : must be about 4 and not 9.xxx !!!???

Best Regards
Conti P.P.

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Bug: Trigonometry functions in relations always use radians

With the axis setting Degrees,

The function
f(x)=sin(x)
gives the following:
x	f(x)
0	0
15	0,2588
30	0,5000
45	0,7071
60	0,8660
75	0,9659
90	1,0000
105	0,9659
120	0,8660
135	0,7071
150	0,5000
165	0,2588
180	0

But the relation
y=sin(x)
are using radians!
x	f(x)
0	0
15	0,6503
30	-0,9880
45	0,8509
60	-0,3048
75	-0,3878

Re: problem with version 4.2

Conti - Elettrosystem wrote:
> Dear all,
> why the software is not able to calculate the area from 2 to 100000 of (ln
> x) / sqrt(x^3) : must be about 4 and not 9.xxx !!!???

It seems to be a problem with Simpson's formula, which Graph uses to 
calculate the area. The area seems to run wild when range gets too 
large. I plan search for a better algorithm when I find the time.

Best regards
Ivan Johansen

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Re: Bug: Trigonometry functions in relations always use radians

Simon Forsberg wrote:
> gives the following:
> Conclusion: In relations, trigonometry functions (or at least the "sin"
> function) always use radians, and ignores the Axes setting!

Yes, the trigonometry setting apparently doesn't have any effect for 
relations. Fortunately it has already been fixed in the beta version of 
Graph 4.3, which is to be released any day now.
You can find it at http://padowan.dk/graph/DownloadBeta.php

Best regards
Ivan Johansen

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will this open on a mac

i tried to download and it doesn't seem to like a mac is this the case or am i
doing something wrong.
thanks tom

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Re: will this open on a mac

tom little wrote:
> i tried to download and it doesn't seem to like a mac is this the case or am i
> doing something wrong.

Graph is a native Windows application and will not run directly on a 
Mac. You will have to use some kind of Windows emulator.

Best regards
Ivan Johansen

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Question about plotting exponential decay

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Re: Question about plotting exponential decay

Peter L. M. Kwan wrote:
>     An exponential decay function should never reach zero no matter how 
> long the time is.   However, it is hardly to see it on the graph, that 
> is, the graph seem to always overlap with the x-axis.  Any method a 
> correct this problem?

Sorry, but I fail to see the problem. Graph will show that the function
gets infinitely close to zero. Visually it may look like the function
touches the x-axis, but that is because your screen has to low a
resolution. If you zoom in on the function you will see that it never
reaches zero.

Best regards
Ivan Johansen

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(no subject)

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