Displaying 6 results from an estimated 6 matches for "foodscience".
2002 Sep 27
0
Response surface methodology
...I
think I could use 'contour' but I'm not certain of the syntax for the
command.
TIA, Peter
Peter Watkins
Research Scientist
Food Science Australia
Private Bag 16
(671 Sneydes Road)
Werribee
Victoria 3030
Australia
Tel: +61-3-9731 3467 Fax: +61-3-9731 3250
E-mail: Peter.Watkins at foodscience.afisc.csiro.au
Web: www.foodscience.afisc.csiro.au
Food Science Australia is a joint venture of CSIRO and Afisc.
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2005 Jun 06
2
Porting Matlab code to R
Hello,
I'm looking at porting code written for Matlab to R.
However, I don't have sufficient knowledge of Matlab to know whether
it's feasible or appropriate.
If there is anyone who has any experience in this and could provide some
advice, I'd be grateful.
TIA, Peter
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2002 Mar 04
1
Solving quadratic functions
I'm examining the use of the 'lm' function to solve quadratic functions.
With S+ 2000, the 'lm' function can be used to solve eqns such as x1 + x2 +
x1^2 + x2^2 + x1*x2.
But, when trying this same eqn with R, the software does not produce any
coefficients for x1^2 or x2^2.
Is this a common problem?
I'm using ver. 1.3.1 under Win. 2000.
Thanks, Peter
2005 Sep 01
1
Dataset size in R
Dear listers,
I would like to know whether a maximum size is set for data sets in R.
I'm planning on analysing data sets which have 330000 points for a
sample. The response is from GCxGC output.
Also, with data analysis, is there a time-cost saving by performing the
analysis in Linux as against doing it in Windows XP?
Many thanks, Peter
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2002 Apr 23
1
Use of nls command
Hello.
I am trying to do a non-linear fit using the 'nls' command.
The data that I'm using is as follows
pH k
1 3.79 34.21
2 4.14 25.85
3 4.38 20.45
4 4.57 15.61
5 4.74 12.42
6 4.92 9.64
7 5.11 7.30
8 5.35 5.15
9 5.67 3.24
with a transformation of pH to H <- 10^-pH
When using the nls command for a set of parameters - a, b and c, I receive
two sets of errors:
>
2005 Sep 08
0
Effect of data set size on calculation
Dear listers,
I have a piece of code which performs an ANOVA type of analysis on 2D GC
data. The code is shown below:
# ANOVA 2D GC analysis
# maxc <- number of samples
# nreps <- number of samples
maxc <- 2
nreps <- 4
sscl <- NULL
cmean <- NULL
#
# Initial stat. variable
#
dftot <- nrow(mat)-1
dfcl <- maxc - 1
dferr <- dftot - dfcl
totmean