Displaying 10 results from an estimated 10 matches for "geochemistry".
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biochemistry
2003 Jul 15
2
R, geochemistry, ternary diagrams
I'm in e-mail contact with a geochemist who maintains a well regarded
geochemistry web site. He's drawing diagrams either with a Turbo Pascal
program running in a DOS window or with Excel. I'm trying to persuade
him that R would be a better choice. Something he's particularly keen
on is ternary diagrams. I think he is talking about ternary phase
diagrams, and if s...
2013 Feb 20
0
Bayesian mixing model
Fellow R users,
I'm using the BCE {BCE} function to run a Bayesian sediment mixing model. The aim is to find the optimum % contribution from each of the 4 source areas that can yield the target geochemistry.
I have geochemistry for 4 source areas called Rat:
Rat<-read.table(text="CaO MgO Na2O Al2O3
Topsoils 2.511250 0.7445500 0.7085500 14.10375
ChannelBanks 55.021500 0.8665000 0.3045000 10.19800
FieldDrains 17.958221 0.9415394 0.2979383 14.68013
RoadRunoff 9.177297 1.9...
2009 Jan 30
1
plotting lines with missing data for x values
I have some data (REE plots - geochemistry) where I have values 1:14 for the
x axis, but have no data for some x values. Here for example, let's say
that I don't have data for x=2,5,8.
So
x<-1:14
y<-c(4, NA, 5, 9, NA, 3.4, 8, NA, 19, 22, 12, 14, 15.3, 15)
if I plot the data
plot(x,y)
and then I want to join with lines
l...
2017 Sep 05
4
Interesting behavior of lm() with small, problematic data sets
...essentially perfect fit: summary may be unreliable
##############
There is a warning that the summary may be unreliable sue to the essentially perfect fit, but a p-value of 0.3112 doesn?t seem reasonable.
As a side note, the various r^2 values seem odd too.
Tim Glover
Senior Scientist II (Geochemistry, Statistics), Americas - Environment & Infrastructure, Amec Foster Wheeler
271 Mill Road, Chelmsford, Massachusetts, USA 01824-4105
T +01 978 692 9090 D +01 978 392 5383 M +01 850 445 5039
tim.glover at amecfw.com amecfw.com
This message is the property of Amec Foster Wheeler p...
2003 Apr 09
0
error compiling portable openssh 3.6.1p1 on SGI IRIX 6.5x
...sename(char *);
^
1 error detected in the compilation of "progressmeter.c".
make: *** [progressmeter.o] Error 2
-------------------------------------------------------
-----------------------
Lachlan M. D. Cranswick
30th March till 5th May 2003 - visiting: Maproom Rm 31
Geochemistry - Lamont-Doherty Earth Observatory of Columbia University
PO Box 1000, 61 Route 9W Palisades, New York 10964-1000 USA
Tel: (845) 365-8302; Fax: (845) 365-8155; E-mail: l.m.d.cranswick at dl.ac.uk
After 6th May 2003:
Neutron Program for Materials Research (NPMR),
National Research Council (NRC),...
2010 Jun 06
1
changing windows variables in wine
Hello all,
I am a mac user running Wine to run geochemistry program on my mac under OS X 10.5.8 using Wine 1.1.35. I've got two out of my three programs up and running without a problem!
When I try to run PhreePlot I get the following error in the wine command prompt:
***Error: Invalid PhreePlot system path.
Check that the PhreePlot environment variabl...
2017 Sep 05
0
Interesting behavior of lm() with small, problematic data sets
...sentially perfect fit: summary may be
unreliable
##############
There is a warning that the summary may be unreliable sue to the
essentially perfect fit, but a p-value of 0.3112 doesn?t seem reasonable.
As a side note, the various r^2 values seem odd too.
Tim Glover
Senior Scientist II (Geochemistry, Statistics), Americas - Environment &
Infrastructure, Amec Foster Wheeler
271 Mill Road, Chelmsford, Massachusetts, USA 01824-4105
T +01 978 692 9090 D +01 978 392 5383 M +01 850 445 5039
tim.glover at amecfw.com amecfw.com
This message is the property of Amec Foster Wheeler...
2024 Jan 30
2
Use of geometric mean for geochemical concentrations
Dear Rich,
It depends how the data is generated.
Although I am not an expert in ecology, I can explain it based on a biomedical example.
Certain variables are generated geometrically (exponentially), e.g. MIC or Titer.
MIC = Minimum Inhibitory Concentration for bacterial resistance
Titer = dilution which still has an effect, e.g. serially diluting blood samples;
Obviously, diluting the
2001 Feb 28
1
Spider diagrams
Hi, I am trying to create what are called "spider diagrams" in the geochemical
literature using R. A spider diagram is basically a plot of the atomic number
versus the concentration on a log scale. Lines are drawn from each atomic
number for each sample.
Right now, my data frame looks like:
SAMPLE SITE V3 LA.NASC LAATNUM CE.NASC CEATMNUM
1 1A:001
2010 Feb 25
5
Plotting 15 million points
Hi All
I have a vector of about 15 million numbers which I would like to
plot. The goal is the see the distribution. I tired the usual steps.
1. Histogram : never gets complete my window freezes w/out log base 10
2. Density : I first calculated the kernel density and then plotted
it which worked.
It would be nice to superimpose histogram with density but as of now I
am not able to get this