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Jens Wegar | 2 Apr 23:35

Re: Bug in Graph 4.2 beta

Ok, so now when I do my moving average trendlines there are occasions 
where the graphlines get broken. In other words, they're not continuous.

Screenshot can be found here:
http://www.gnejsi.net/bugreporting/Graph/brokenlines.jpg

and the data used to produce it here:
http://www.gnejsi.net/bugreporting/Graph/gapdata.csv

The period for the moving average was set to 10.

The problem does not seem to be random, because if I redo the trendline 
the gaps appear at the same places. If I set the period to 20 the gaps 
also appear. Any suggestions as to what might cause this behaviour? I 
looked through my data and there are some places where the values are 
considerably higher than any neighbouring values. Could this be the 
problem? But why would it show up as a gap instead of a spike in that case?

cheers
-Jens

Jens Wegar wrote:
> Ivan Johansen wrote:
> 
>> Jens Wegar wrote:
>>
>>> the trendline dissapears never to be seen again. The legend as well 
>>> as the entry
>>> in the left-side list are still there. However, the actual graph is 
>>> not visible
(Continue reading)

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Ivan Johansen | 4 Apr 18:28
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Re: Bug in Graph 4.2 beta

Jens Wegar wrote:
> The problem does not seem to be random, because if I redo the
> trendline the gaps appear at the same places. If I set the period to
> 20 the gaps also appear. Any suggestions as to what might cause this
> behaviour?

The moving average is created as a parametric function. If you edit the
function you can see that it as default uses 1000 steps, and that is
apparently too low for your case. If you change the number of steps to
10000 it looks much better, but unfortunately it will also take much
longer to be drawn.

> I looked through my data and there are some places where the values
> are considerably higher than any neighbouring values. Could this be
> the problem? But why would it show up as a gap instead of a spike in
> that case?

Yes, that is part of the problem. When a graph suddenly jumps, the
program tries to guess if the vertical line should be shown or not. For
example the function f(x)=1/x should not be shown with a vertical line
at x=0. In this case Graph guessed wrong because there are too few steps.

I plan to improve this so moving averages are no longer created as
functions. This will make sure it is always drawn correctly and it
should be drawn a lot faster. But I probably won't have time to 
implement this until Graph 4.3.

Best regards
Ivan Johansen
(Continue reading)

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Jens Wegar | 5 Apr 00:37

Re: Bug in Graph 4.2 beta

Ok, thanks! As long as I know what to do in order to fix it :)

cheers
-Jens

Ivan Johansen wrote:
> Jens Wegar wrote:
> 
>> The problem does not seem to be random, because if I redo the
>> trendline the gaps appear at the same places. If I set the period to
>> 20 the gaps also appear. Any suggestions as to what might cause this
>> behaviour?
> 
> 
> The moving average is created as a parametric function. If you edit the
> function you can see that it as default uses 1000 steps, and that is
> apparently too low for your case. If you change the number of steps to
> 10000 it looks much better, but unfortunately it will also take much
> longer to be drawn.
> 
>> I looked through my data and there are some places where the values
>> are considerably higher than any neighbouring values. Could this be
>> the problem? But why would it show up as a gap instead of a spike in
>> that case?
> 
> 
> Yes, that is part of the problem. When a graph suddenly jumps, the
> program tries to guess if the vertical line should be shown or not. For
> example the function f(x)=1/x should not be shown with a vertical line
> at x=0. In this case Graph guessed wrong because there are too few steps.
(Continue reading)

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John Lakkas | 9 Apr 09:57
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Not saving custom functions argument ranges

Not saving custom functions in argument ranges
I have version 4.1 of the Graph program. I think I have
found a bug.
Windows XP Pro, SP1

Firstly you have to insert a custom function (for
example f(x)=x^2)
Then insert a function in the axes (let’s say the f(x))
with an argument range form –f(1) to f(1), save this
graph to a *.grf file (the default graph type) and
close the program.
When you open it again and load this file there won’t
be saved the argument ranges with the custom functions
but only the ones with the final numbers.

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Ivan Johansen | 10 Apr 21:22
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Re: Not saving custom functions argument ranges

John Lakkas wrote:
> When you open it again and load this file there won’t
> be saved the argument ranges with the custom functions
> but only the ones with the final numbers.

I have recently been made aware of this problem. I have already fixed it 
in the beta version of Graph 4.2, which you can find at:
http://padowan.dk/graph/SetupGraphBeta.exe

Best regards
Ivan Johansen

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pcaluza | 22 Apr 10:05
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evaluation table

Why can't I use evaluation table function? The button is inactive.

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Ivan Johansen | 23 Apr 19:05
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Re: evaluation table

pcaluza wrote:
> Why can't I use evaluation table function? The button is inactive.

You need to select a function in the list to the left.

Best regards
Ivan Johansen

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