DPlot

Suggestions/Questions :: RE: How to substract two data-curves from each other?

Author: EdK
Posted: Tue Mar 09, 2010 2:39 pm (GMT -5)
Topic Replies: 2

Thanks a lot!
I will try that!

Suggestions/Questions :: RE: How to substract two data-curves from each other?

Author: DPlotAdmin
Posted: Tue Mar 09, 2010 12:38 pm (GMT -5)
Topic Replies: 2

Generate->Y=f(X,Y1,Y2,...)

Y=Y1*Y2 (or whatever)

The result will be evenly-spaced in X, not necessarily at the input X's. That function does a linear interpolation between X's that bound an output X to find the Y1 and Y2 values.
_________________
David Hyde
support@dplot.com

Suggestions/Questions :: How to substract two data-curves from each other?

Author: EdK
Subject: How to substract two data-curves from each other?
Posted: Tue Mar 09, 2010 9:59 am (GMT -5)
Topic Replies: 2

Hi all!

I have a little trouble with a simple task:

If I have two surfaces in one plot, it is easy to e.g. multiply or divide the surfaces with each other by using the Z3=f(Z1,Z2) function.

So I have data sets like
Xa1, Ya1, Za1; Xa2, Ya2, Za2; ...
Xb1, Yb1, Zb1; Xb2, YB2, ZB2; ...
...

and can easily multiplicate or divide surface a and surface b, which are defined by the data points.

However, I have been looking for a while now to do exactly the same for 2D data but did not find anything...

So I have
Xa1, Ya1; Xa2, Ya2; ...
Xb1, Yb1; Xb2, YB2; ...
...

Is there any possibility to multiply or divide the curves a and b resulting from these data points (not functions!)?

I am currently using the trial version of DPlot but I am going to order it ASAP.

Thanks for your help!

Ed

Suggestions/Questions :: RE: Problems with date number format

Author: DPlotAdmin
Posted: Thu Mar 04, 2010 5:27 pm (GMT -5)
Topic Replies: 2

The problem is with the "Date and Time" number format, not anything to do with "Edit>YYYYMMDDHHMM to Serial...". If you right-click on the dates along the X axis and choose "Calendar Date" instead of "Date and Time" then you'll get proper pre-1900 dates.

The goof here is that DPlot originally had the same limitations as Excel dates: Jan 1, 1900 through Dec 31, 2078 (just a guess, but MS must have wanted to be able to represent the date as an unsigned 2-byte integer). The "Calendar Date" number format and other date-related features were later modified to accept dates from Oct 15, 1582 to Dec 31, 9999, but the "Date and Time" number format didn't follow suit. This is fixed at my end and will be included in the next release.

Thanks again for pointing out the problem.
_________________
David Hyde
support@dplot.com

Suggestions/Questions :: RE: Problems with date number format

Author: DPlotAdmin
Posted: Thu Mar 04, 2010 9:58 am (GMT -5)
Topic Replies: 2

John,
Thanks for pointing the problem out. It is indeed because the Excel serial number system goes negative with pre-1900 dates, but there's no reason DPlot can't handle this correctly. I'll either fix it or sheepishly explain why it can't be done for the next release.
_________________
David Hyde
support@dplot.com

Suggestions/Questions :: Problems with date number format

Author: John
Subject: Problems with date number format
Posted: Thu Mar 04, 2010 12:34 am (GMT -5)
Topic Replies: 2

In using the "Edit>YYYYMMDDHHMM to Serial..." command, it correctly displays dates after 1900, but anything pre-1900 (e.g., 1850,1860,1870,1880,1890 in the form of 185001010000, etc.) is displayed as ########## in the graph. If I use the "Edit>Edit Data..." menu command, all the dates display correctly. If I'm reading things correctly, I notice the pre-1900 serial numbers (i.e., when displayed in default number format rather than date format) are negative and this is where the above problem occurs.

Hope I'm not missing anything obvious here, but any help would be appreciated.
_________________
--John
Using Dell Optiplex GX 260, Windows XP Professional SP3, Intel Pentium 4 @ 2.66 GHz, 1GB RAM.

Suggestions/Questions :: RE: Edition of minorgrid color separately

Author: villela
Posted: Mon Mar 01, 2010 8:24 pm (GMT -5)
Topic Replies: 2

Thanks, David.

Suggestions/Questions :: Suggestion: Background image(s) with 3D Contour plot

Author: gks
Subject: Suggestion: Background image(s) with 3D Contour plot
Posted: Mon Mar 01, 2010 4:46 pm (GMT -5)
Topic Replies: 0

I am evaluating the capability of DPlot for my application. Overall, this is the great software with this price. I am going to buy it anyway.
My application requires the background image(s) -- layer(s) of PCBA drawings, and foreground with a 3D Contour (rainbow colored) graphic shows the NFE (Near Field Emission) level. The foreground should be able to Alpha-blend with background image.

This can be done with another application (like Visio), but needs additional steps. It will be a great feature if this can be done in DPlot application.

I saw someone had already suggested this feature in this forum back in December, but had no reply.

Suggestions/Questions :: RE: Suggestions - Windowed Zoom, Average Value Between Cursor

Author: jsc
Posted: Mon Mar 01, 2010 3:59 pm (GMT -5)
Topic Replies: 3

Yes, using the arrow keys with a Y2 axis are a bit quirky. The left and right arrows keys work okay for panning once zoomed in, but don't use the up and down because it messes up the display scaling. When I find an area that I'm interested in, I have to return to no zoom, then zoom back in with one selection. Then if I can pan only left and right, I'm in pretty good shape.

Suggestions/Questions :: Sum function

Author: jsc
Subject: Sum function
Posted: Mon Mar 01, 2010 3:53 pm (GMT -5)
Topic Replies: 0

I'm having a little trouble understanding where and how this function could be used.

I'd love to do this: sum(if(Y1>600,1,0))

and have DPlot immediately calculated a running total of equation at each point dX. But that is not allowed.

I first have to build the curve, then sum it. Or from the menu, I could integrate the curve in this case. Both generate an additional curve, and I'm trying to stay under that 9 curve limit for being able to do calculations on curves.

Any ideas? (Am I doing this all wrong?)

Suggestions/Questions :: RE: Suggestions - Windowed Zoom, Average Value Between Cursor

Author: jdm
Posted: Mon Mar 01, 2010 3:23 pm (GMT -5)
Topic Replies: 3

Thanks for the tips jsc. The "List Peak Values within a Range" is exactly what I was looking for.

Zooming and panning are still a bit quirky for me. Try this; create a 2D XYYY plot with variable on Y and an Independent Y2. Y range = 0-200. Y2 Range = 0-1000. My Y data is falls 0-40, my Y2 data is 180-240. I set the Y and Y2 range so that all the curves can be visible as I zoom in and the noise in the data is not so visible. Once I've zoomed in on the part of the chart I want to examine I can pan left,right,up and down using the arrow key or cntrl arrow for finer increments.

If I zoom in and use <cntrl> up and <cntrl> down, the y2 scale begins to change and my Y2 graph begins to flatten. If I do three up and three down repeated 5 times my new Y2 range is -900,000 to +1.2M. The Y range stays the same.

A bit strange...

jdm

Suggestions/Questions :: Boolean Operators

Author: jsc
Subject: Boolean Operators
Posted: Mon Mar 01, 2010 9:05 am (GMT -5)
Topic Replies: 0

I was looking for a Boolean "AND", but found that this kind of formula worked in the Generate f(X,Y1,Y2...):

"if(if(Y1<5,1,0)+if(Y2>600,1,0)=2,1,0)"

Is there an easier way?

But I guess this will do the job!

Suggestions/Questions :: RE: Edition of minorgrid color separately

Author: DPlotAdmin
Posted: Sat Feb 27, 2010 7:49 pm (GMT -5)
Topic Replies: 2

Good suggestion, thanks. I'll try to have this in the next release.
_________________
David Hyde
support@dplot.com

Suggestions/Questions :: Edition of minorgrid color separately

Author: villela
Subject: Edition of minorgrid color separately
Posted: Sat Feb 27, 2010 5:25 pm (GMT -5)
Topic Replies: 2

I would like to edit the color of the minor grid separately of the grid. I think this is useful because I could use the minor grid with the same line type and thickness of grid and distinguish easily between them.

Thanks.

Suggestions/Questions :: RE: Pie Charts?

Author: DPlotAdmin
Posted: Tue Feb 23, 2010 9:37 am (GMT -5)
Topic Replies: 1

No. I'm not a big believer in pie charts, sorry.
_________________
David Hyde
support@dplot.com