Hi Matt,
In general my first approach would be to contact the package maintainer/author
with questions.
The World Bank example with monthly data runs quite smoothly on my PC using
Windows XP and IE7.
However, I can see that the performance deteriorates compared to the original
demo.
The gvisMotionChart function currently only accepts a time variable as numeric
or a date variable.
My understanding is that if you use a date variable the Google API will
interpolate all missing days, which increases the work load for the rendering
engine.
Alternative time dimension would be acceptable by the API as well, e.g. weekly
or monthly data, see:
http://code.google.com/apis/chart/interactive/docs/gallery/motionchart.html
This could improve the performance also for monthly data.
Currently gvisMotionChart doesn't accept weekly or quarterly data, but it is
something to consider for a future version.
For the time being you could upload your data to a Google Spreadsheet and play
around with the motion chart gadget to understand if the performance of your
data would improve if you would change your time variable to weekly or quarterly
data.
I hope this helps.
Kind regards
Markus
-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
On Behalf Of Matt Pocernich
Sent: 31 October 2011 16:11
To: r-help at r-project.org
Subject: [R] googleVis motionchart - slow with Date class
Hi,
I am trying to create a googleVis motion chart with monthly data. When
formatting the date column as a Date class variable, the plot as presented in
the browser becomes considerably slower and very prone to crashing the browser.
To illustrate this issue I have modified the WorldBank demo.
### objects from demo("WorldBank", package = "googleVis") M
<- gvisMotionChart(subData, idvar="country.name",
timevar="year", options=list(width=700, height=600))
plot(M)
This works fine and I can smoothly move back and forth between the scatter plots
and the line plots.
## here I express the date as a Date class object - arbibrarily assigning each
year to June 1st.
subData$year2 <- as.Date(ISOdate(subData$year, 6, 1 ))
M2 <- gvisMotionChart(subData, idvar="country.name",
timevar="year2", options=list(width=700, height=600))
plot(M2)
Using Chrome, this plot is very slow to load and it appears when pressing play
that the date field fills in each day of the year.
Trying to go back and fourth between the line plot and the scatter plot will
crash the browser.
Is there a better way to express monthly data? I have tried converting it to a
numeric in the form of yyyymmdd or yyyymm, but this didn't work?
I am also wondering. is the best place to post a question about googleVis? I
notice threads on stackoverflow and other places.
Thanks,
Matt
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