loop for a+bx using multiple waves and indices??
the loop will calculate y from 12 different x waves. each 1D x wave has multiple values. the x waves are called ion0, ion1, ..., ion11
the coefficients a and b are derived from 12 different coefficient waves in which p=0 defines a and p=1 defines b.
the coefficient waves are called coeff0, coeff1, ... coeff11. so a of coeff0 is coeff0[0] and b of coeff0 is coeff0[1].
the loop will need to cycle through all point values in each ion wave before moving on to the next ion and coefficient.
the name of the destination wave will also need to coordinate with ion values.
i have tried to use a matrixop in a for loop to deal with this problem, but my attempts have been unsuccessful.
the current data i'm using is derived from a larger procedure which can be found at the bottom of this post. pertinent files for loading are attached (open snow.txt first and ionconcentrations.txt second)
my code looks like this:
for(index = 0; index<12; index+=1)
for(i=0; i<5; i+=1)
matrixop $("CalcConc"+num2str(index))= $("coeff"+num2str(index))[0] + $("coeff"+num2str(index))[1] * $("ion"+num2str(index))[i]
endfor
endfor
this method doesn't work for reasons that are probably obvious to more experienced igor users than me (1month).
i'd really appreciate some assistance if anyone sees the way through this problem.
thanks in advance!
Ryan
#pragma rtGlobals=3 // Use modern global access method and strict wave access.
Function load(pathName, filePath)
string pathName, filePath
if (strlen(filePath) == 0)
Open/D/R/P=$pathName refNum as filePath
if (strlen(S_fileName) == 0)
return -1
endif
filePath = S_fileName
endif
LoadWave/J/D/K=2/A/V={""," $",0,0}/L={0,0,0,0,1}/P=$pathName filePath
wave/T wave0
Extract4thColumn(wave0)
wave Sig1
make/o/N=(numPnts(Sig1)) PeakArea
PeakArea = Sig1
MatrixOp/o PeakArea = replace(PeakArea, NaN, 0)
variable index
string name, name2
make/o/N=10 tempwave
for(index = 0; index<12; index+=1)
name = "PA" + num2str(index)
name2 = "ion" + num2str(index)
extract/o PeakArea, tempwave, p>=14*index && p<=14*index + 13
duplicate tempwave, $name
duplicate tempwave, $name2
endfor
killwaves tempwave
make/o/N=14 ion0, ion1, ion2, ion3, ion4, ion5, ion6, ion7, ion8, ion9, ion10, ion11
deletepoints 0, 10, ion0, ion1, ion2, ion3, ion4, ion5, ion6, ion7, ion8, ion9, ion10, ion11
edit ion0, ion1, ion2, ion3, ion4, ion5, ion6, ion7, ion8, ion9, ion10, ion11
make/o/N=10 PA0, PA1, PA2, PA3, PA4, PA5, PA6, PA7, PA8, PA9, PA10, PA11
edit PeakArea
appendtotable PA0, PA1, PA2, PA3, PA4, PA5, PA6, PA7, PA8, PA9, PA10, PA11
load2("","")
wave conc0, conc1, conc2, conc3, conc4, conc5, conc6, conc7, conc8, conc9, conc10, conc11
string nom, nom2
for(index = 0; index<12; index+=1)
nom = "Coeff" + num2str(index)
nom2 = "SD" + num2str(index)
CurveFit/NTHR=0 line $("Conc"+num2str(index)) /X=$("PA"+num2str(index))
wave w_coef, w_sigma
duplicate w_coef, $nom
duplicate w_sigma $nom2
appendtotable $nom, $nom2
endfor
wave coeff0, coeff1, coeff2, coeff3, coeff4, coeff5, coeff6, coeff7, coeff8, coeff9, coeff10, coeff11
variable i
for(index = 0; index<12; index+=1)
for(i=0; i<5; i+=1)
matrixop $("CalcConc"+num2str(index))= $("coeff"+num2str(index))[0] + $("coeff"+num2str(index))[1] * $("ion"+num2str(index))[i]
endfor
endfor
End
Function load2(pathName, filePath)
string pathName, filePath
if (strlen(filePath) == 0)
Open/D/R/P=$pathName refNumas filePath
if (strlen(S_fileName) == 0)
return -1
endif
filePath = S_fileName
endif
LoadWave/J/D/O/K=1/A/B="N='Concentration';"/P=$pathName filePath
wave Concentration
variable index
string name
make/o/N=10 tempwave
edit Concentration
appendtotable
for(index=0; index<12; index+=1)
name = "Conc" + num2str(index)
extract/o Concentration, tempwave, p>=10*index && p<=10*index + 9
duplicate/o tempwave, $name
appendtotable $name
endfor
killwaves tempwave
End
Function Extract4thColumn(w)
wave/T w
w = ReplaceString("\t\t",w[p], "\t")
make/d/o/n=(DimSize(w,0)) Sig1
Sig1 = str2num(StringFromList(3, w[p], "\t"))
End
This is not going to work because MatrixOP does not support any strings on the right hand side of the equation.
The packing of your coefficients (a) and (b) leave something to be desired. I'd rearrange them as separate waves wa={a[i]} and wb={b[i]}, then concatenate all the x waves as columns of a matrix, say wavex. The result would be a simple matrix equation:
A.G.
WaveMetrics, Inc.
July 3, 2014 at 02:47 pm - Permalink