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Profile MJKelleher
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Message 2852 - Posted: 20 Feb 2006 | 6:55:12 UTC

The graphs look very sharp, particularly the third one. The summary data with the first are quite helpful too, are they generated with both scripts, or just with the Perl? Is there a defined significance to the different shades of color, or is it just for visual interest?

MJ
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Message 2853 - Posted: 20 Feb 2006 | 12:39:59 UTC - in response to Message 2852.

The graphs look very sharp, particularly the third one. The summary data with the first are quite helpful too, are they generated with both scripts, or just with the Perl? Is there a defined significance to the different shades of color, or is it just for visual interest?

MJ


The first plot is generated with the 'stripchart.cgi' perl script which comes with BOINC, modified to produce PNG instead of GIF. The second and third are from a ROOT script which I wrote. The second is direct JPEG output, while the third is EPS output then converted to JPEG using Ghostscript. I think the third is a little crisper, but the size isn't right (yet). The shades of colors don't have meaning. I picked green in ROOT because stripchart used green.

The data are all from the same source, a 1-wire weather station on a different machine which uploads measurements every half hour. At some point this device may get put up at the top of the mast, in which case we can also get wind speed and direction. But for now it's just sitting on a desk reporting the temperature.

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Message 2868 - Posted: 21 Feb 2006 | 14:29:30 UTC

Wasn't one of them turned 90 degrees? I thought it made for a nice half pine tree picture. :)
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Message 2869 - Posted: 21 Feb 2006 | 15:31:06 UTC

Hmmm, what pine tree graphs are you actually talking about? Do I hav ea chance to see them without any RSS reader?
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Message 2890 - Posted: 22 Feb 2006 | 2:36:21 UTC - in response to Message 2868.

Wasn't one of them turned 90 degrees? I thought it made for a nice half pine tree picture. :)


Yes, it was turned 90 degrees, but I fixed that. Now it's too small. Or more correctly, it fills the bottom of a portrait page, and I need to get the white space at the top to go away. In time...

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Message 3076 - Posted: 1 Mar 2006 | 19:54:15 UTC - in response to Message 2869.
Last modified: 1 Mar 2006 | 19:55:08 UTC

Hmmm, what pine tree graphs are you actually talking about? Do I have a chance to see them without any RSS reader?

OK, I realized, Captain's Cabin temperature monitor. The original link to graphs was not very helpful :-(

Is the ROOT script able to specify produced JPEG's quality? I assume not. Probably neither select a sharp PNG output :-( Was at least the EPS graph sharp?
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Message 3077 - Posted: 1 Mar 2006 | 20:07:16 UTC
Last modified: 1 Mar 2006 | 20:08:06 UTC

Is it possible to add second scale to the generated graph's right side? For two (or more) timely related graphs, but highly different value scales, e.g. outside temperature to the left, inside temperature (in the owen :) to the right, or electric current and voltage, or...

Internationalization issues: In our half-pine-tree case, this way it could be possible to add Celsius scale to the right.
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Message 3078 - Posted: 1 Mar 2006 | 21:54:46 UTC - in response to Message 3076.

Is the ROOT script able to specify produced JPEG's quality? I assume not. Probably neither select a sharp PNG output :-( Was at least the EPS graph sharp?


Aye, the EPS is very nice, but won't show on the web. The JPEG produced from it is a little sharper, I think. Even better yet would be SVG, but that is going to require a bit more work.

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Message 3079 - Posted: 1 Mar 2006 | 21:57:52 UTC - in response to Message 3077.

Is it possible to add second scale to the generated graph's right side? For two (or more) timely related graphs, but highly different value scales, e.g. outside temperature to the left, inside temperature (in the owen :) to the right, or electric current and voltage, or...


Aye, ROOT is very good for that.

Internationalization issues: In our half-pine-tree case, this way it could be possible to add Celsius scale to the right.


Good point. I'll see what I can do to get both scales to show.

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Message 3123 - Posted: 7 Mar 2006 | 15:57:24 UTC - in response to Message 3077.
Last modified: 7 Mar 2006 | 15:58:19 UTC

Internationalization issues: In our half-pine-tree case, this way it could be possible to add Celsius scale to the right.

Good idea. Consider it done.

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Message 3124 - Posted: 7 Mar 2006 | 17:39:02 UTC - in response to Message 3123.

Internationalization issues: In our half-pine-tree case, this way it could be possible to add Celsius scale to the right.

Good idea. Consider it done.

YES! Finally I can imagine how cold is there :-)
And I'd call the ROOT/PNG combination at least very fine. (Until I'll see the EPS output and consider it much better :) but it's not so simple to view it on a webpage.)
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Message 3161 - Posted: 20 Mar 2006 | 23:55:35 UTC - in response to Message 3124.


YES! Finally I can imagine how cold is there :-)

Was it really that cold in Cap'n Jack's cabin this morning? :-D (Or was it already yesterday? OK, Mar 20. 07:00)

BTW, what does the blue triangle at the Temperature(C) mean? UP for EPS and DOWN for direct bitmap? I don't think so, and neither does it look like a temperature trend.
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Message 3164 - Posted: 21 Mar 2006 | 17:16:22 UTC - in response to Message 3161.

BTW, what does the blue triangle at the Temperature(C) mean? UP for EPS and DOWN for direct bitmap? I don't think so, and neither does it look like a temperature trend.

The blue triangle marks the most recent reading. It is otherwise difficult to read it from the rightmost edge of the graph. It will only be shown if the last value in the graph is recent enough.

The old mechanical strip chart recorders had a physical pen that you could look at to see the latest value. I wanted something similarly visible.

EPS output uses an upward triangle, while direct bitmap output uses a lower pointing triangle, and this is a small bug in ROOT. I will eventually turn this into another marker which shows the value more clearly, perhaps a triangle turned on it's side (wow :-)

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Message 3167 - Posted: 23 Mar 2006 | 17:41:13 UTC

The animated chart is sharp! And the dark/light data lines contribute to the animation feel. Nice!

MJ
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Message 3169 - Posted: 24 Mar 2006 | 16:16:04 UTC - in response to Message 3167.

The animated chart is sharp! And the dark/light data lines contribute to the animation feel. Nice!


Thanks, I'm glad you like it. I hope the animation will be useful someday, though for now it's more just for fun.

What I'm more proud about right now is this graph:


This is real data (minute-trend averages, actually) from a seismometer at the LIGO Observatory at Hanford, Washington, for the hour following 15:59:46 UTC on Feb 13, 2006 (just chosen at random). Getting all the software to work so that I could produce this plot for a web page took a lot more effort than plotting the temperature in my office. It's only a small step toward building the full tool I'm working on, but an important one.

Hopefully I will now have some time to update the Pirates site and then update some new applications. We have a few new ideas to try now for the Linux crew, and at some point a new app for the Windows crew.


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