Suggestions for graphing software...
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… preferably free, but cheap is good too. All I want to do is set up an X axis, set up a Y axis, and plot a line-scatter graph. It seems Excel can't do this with non-linear X values on a linear X axis - or I can't coerce it to do so. Either way, I have given up struggling with it, to the point where I am prepared to drop some valuable beer vouchers on the problem. If anyone has any suggestions, I would be very glad to hear them.
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… preferably free, but cheap is good too. All I want to do is set up an X axis, set up a Y axis, and plot a line-scatter graph. It seems Excel can't do this with non-linear X values on a linear X axis - or I can't coerce it to do so. Either way, I have given up struggling with it, to the point where I am prepared to drop some valuable beer vouchers on the problem. If anyone has any suggestions, I would be very glad to hear them.
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Thanks for that - it looks useful, but I need something that I can import Excel or CSV data into. I have a LOT of data! :sigh:
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I just plugged two sets of random numbers into Excel (2013) and produced a proper scatter plot. I followed these steps to get the trend line: trendline example. Is your data set too big for Excel?
if (Object.DividedByZero == true) { Universe.Implode(); }
The scatter graph works fine for X-Y points, but the data collection points are equally spaced on the graph, where they are, in fact, non-linear to the point of being random. They are closely spaced at the start of the X-axis, becoming sparser further along - but they are essentially just points where data had been collected, and adhere to no mathematically defined function. I want to impose a linear X-axis, say from 0 to 100, and have the graph points plotted along that linear axis. If I just use the X-Y data in a plot, then the X-axis is divided into equidistant points for the X value and the Y value plotted above it. If I add a third column of data to represent the X-axis, Excel accepts it but then draws two graphs, one for the X values and one for the Y values. If it were not for the 11,000 odd data points, I would use a piece of graph paper...
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Scilab seems like the way to go. Several of my scientific co-workers use that for dealing with data sets doing all kinds of stuffs that physics does with data, including non-linear axes.
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I don't have a solution to offer, but I'm wondering if you could give some usable example data?(rigged-up or otherwise) I certainly recognize that this simple need has arisen more times than I can remember. It's time to dabble in tool-building. This kind of issue is a lot like when I only want to make a simple chicken-scratch sketch using old-school Paint but the system I happen to be using only has a major drawing program that takes too-long/forever to load up. Or I just want to type a sentence and a bloated word processor starts loading. Great to have some of the suggestions - checking out GNUPlot and some of the free-or-inexpensive options.
Pete K.
Pete Kelley wrote:
This kind of issue is a lot like when I only want to make a simple chicken-scratch sketch using old-school Paint but the system I happen to be using only has a major drawing program that takes too-long/forever to load up. Or I just want to type a sentence and a bloated word processor starts loading.
'Twas always thus! In fact, although I said I didn't want to write a line of code, I am now thinking of writing an add-on for access to solve precisely this problem.
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At the risk of sounding dumb, I can't see the problem - what are 'non-linear X values' ? You can't just mean they are at unequal X-intervals, because surely that is trivial, even for Excel?
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So, how was the salmon? ;) Anyway I got 'yer Codez. It's like 6 lines of code.
# Install & Load Library
if (!require("readxl")) install.packages("readxl")
library("readxl")Choose & Read Excel file, the 2 denotes the desired sheet number.
my_data <- read_excel(file.choose(), 2)
Extract data from the desired columns. RStudio will provide drop-down with column names.
Ydata <- my_data$Column_With_Ydata
Xdata <- my_data$Column_With_XdataPlot data
plot(Ydata, Xdata)
As with any code you can get as fancy as you want, but for a one time look see...
It was broke, so I fixed it.
The salmon was exquisite, thanks for asking. Served with fresh asparagus and pasta shells, and accompanied with ice-cold Löwenbräu. If my coding were as good as my cooking, I would be richer than Bill Gates! :laugh: As for the rest of it, thanks, but I have decided to write an add-on to Excel to fix this problem, as I seem to recall having suffered from it before.
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… preferably free, but cheap is good too. All I want to do is set up an X axis, set up a Y axis, and plot a line-scatter graph. It seems Excel can't do this with non-linear X values on a linear X axis - or I can't coerce it to do so. Either way, I have given up struggling with it, to the point where I am prepared to drop some valuable beer vouchers on the problem. If anyone has any suggestions, I would be very glad to hear them.
My apologies to those who replied yesterday, but did not get an answer. We currently have the builders in, converting my old office in the stables into a self-contained flat, and what with shopping in IKEA, making tea for the builders, making sure they were following my plans, and visiting a couple of clients, the day just disappeared.
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See my reply to Foothill above. If you know of how it can be done, I would love to hear about it.