| Author |
 Topic  |
|
|
belmore
USA
Posts |
 Posted - 02/11/2008 : 4:16:57 PM
|
Origin Version 7.5
Operating System: Windows
Data is for visible light absorption spectra collected at different applied electrical potentials (mV). Data is arranged as wavelength (x-column), mV (y-columns, first row) and absorption (y-columns). The mV data is not uniformly spaced. Example:
Wavelength(x) Abs(y) Abs(y) Abs(y) Abs(y) Abs(y)
-- 317 175 164 143 119
800 0.001 0.001 0.000 0.001 0.000
700 0.101 0.154 0.235 0.385 0.033
600 0.152 0.384 0.762 1.121 1.081
How can I convert this to a matrix and 3D plot with wavelength as x-axis, mV as y-axis, and absorption values on the z-axis?
Thank You
Brad |
|
|
greg
USA
1379 Posts |
Posted - 02/12/2008 : 09:49:14 AM
|
What you have is data in a matrix form with non-linear mapping parameters (at least non-linear across columns). Unfortunately, while a tool available in File Exchange has script to do that, Origin still does not have a routine to convert this kind of data to a matrix.
Here is the code that converts this kind of data to an XYZ worksheet. Once you have the XYZ, then you can use Random Gridding to get your matrix. Warning: Code is destructive, so work with a duplicate if you need the original data.
// BEGIN SCRIPT
// First column from row two is X (or Y) and
// First row from column two is Y (or X)
// (the reverse case can be covered by swapping X and Y afterward)
get wcol(1) -e last;
last-=1;
wks.col=2;
wks.insert(NewData);
wo -a 1;
tempcol=wks.ncols;
copy -b 2 wcol(1) wcol(tempcol) -b 2 -e $(last+1);
wo -a 1; // Worksheet columns: first NewData data data ... data tempcol tempy
copy wcol(1) wcol(tempcol); // copy first column
set wcol(tempcol) -e $(last+1);
for(col=3;col<tempcol;col++) { // extract steps from row 1
wcol(wks.ncols)[col-1]=wcol(col)[1];
}
mark -d wcol(1) -b 1 -e 1;
for(col=4;col<tempcol;col++) {
copy -a wcol(tempcol) wcol(1); // append to first
doc -uw;
copy -a wcol(col) wcol(3); // append to data
};
for(col=4;col<=tempcol;col++) {
delete wcol(4);
};
numgrp=tempcol-3;
for(n=1,thisrow=1;n<=numgrp;n++,thisrow+=last) {
set wcol(2) -b thisrow;set wcol(2) -e thisrow+last-1;wcol(2)=wcol(4)[n];doc -uw;
}
set wcol(2) -b 1;
delete wcol(4);
wks.col3.name$=ZData;
wks.col3.type=6;
doc -uw;
// END SCRIPT
To execute:
Copy and paste the code to the Script Window (under Window menu)
With your worksheet active, highlight all code and press Enter
Select the C(Z) column and choose Edit : Convert to Matrix : Random
|
 |
|
| |
Topic |
|
|
|
3D plot, many Z columns, nonuniform Y