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Re: IDL Strip Chart [message #40903 is a reply to message #40899]

Thu, 09 September 2004 12:37

Haje Korth
Messages: 651
Registered: May 1997

Senior Member

I would define the maximum length of the arrays before hand. Appending can
take fairly long once arrays get large. That is at least the expereince I
had in the past.

Haje

"R.G. Stockwell" <noemail@please.com> wrote in message
news:EW00d.17$ts4.29302@news.uswest.net...
> <pestMay@gmail.com> wrote in message
news:MIO%c.17702$iS.1208@newssvr29.news.prodigy.com...
>> For anyone involved in real-time data collection (e.g., atmospheric
data,
>> heart-rate,
>> other physiological data) display this data as it arrives, say on a
serial
>> port, is essential
>> in monitoring the data stream.
>>
>> There are many commercial hardware/software solutions (e.g., BIO-PAC)
and an
>> IDL
>> competitor, MATLAB, has one. The X-axis is always time, and often there
are
>> a number of
>> channels of data that might include an event marker (e.g., we just
launched
>> the weather sound,
>> a subject in an experiment pressed a button, etc.).
>>
>> Ed May
>
>
> I had a few minutes to kill before a meeting, so here is a quicky strip
chart
> in direct graphics. It is not the most efficient thing ever, but it will
give you
> a starting point.
>
> Cheers,
> bob
>
>
>
>
> xr = [0,100]
> yr=[-4,4]
>
> plot,fltarr(1),xr=xr,yr=yr
>
> timeincrement = 1 ; the sample interval
> datacounter = 0
>
> datatime = !values.f_nan
> data = !values.f_nan
>
>
>
> for i = 0,1000 do begin
> ; make measurement
> newdata = (randomn(seed,1))[0]
> datatime = [datatime,i]
> data = [data,newdata]
> datacounter = datacounter+1
>
> if datacounter gt 50 then begin
> ;shift the axis
> xr = xr + timeincrement
>
> ;redraw data
> plot,datatime,data,xr=xr,yr=yr,psym=-4
>
> endif else begin
> if i gt 0 then begin
> plots,datatime[datacounter],data[datacounter],psym=-4,/data, /continue
> endif else begin
> plots,datatime[datacounter],data[datacounter],psym=4,/data
> endelse
> endelse
> wait,0.1
>
> endfor
>
>
> end
>
>

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[Message index]

		Re: IDL Strip Chart By: R.G. Stockwell on Fri, 10 September 2004 08:25
		Re: IDL Strip Chart By: R.G. Stockwell on Fri, 10 September 2004 08:23
		Re: IDL Strip Chart By: John Smith on Fri, 10 September 2004 08:20
		Re: IDL Strip Chart By: btt on Fri, 10 September 2004 07:42
		Re: IDL Strip Chart By: pestMay on Thu, 09 September 2004 18:20
		Re: IDL Strip Chart By: Haje Korth on Thu, 09 September 2004 12:37
		Re: IDL Strip Chart By: Paul Van Delst[1] on Thu, 09 September 2004 12:00
		Re: IDL Strip Chart By: R.G. Stockwell on Thu, 09 September 2004 11:02
		Re: IDL Strip Chart By: pestMay on Wed, 08 September 2004 18:53
		Re: IDL Strip Chart By: Paul Van Delst[1] on Wed, 08 September 2004 14:50
		Re: IDL Strip Chart By: Mark Hadfield on Wed, 08 September 2004 14:26

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