Trying to load files from a folder

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Wed, 02/07/2024 - 09:34 am

I am new to IGOR and trying to create a procedure to lad all csv files from a folder. The files all have two columns and I want them to be plotted. I have attached the code I have but the problem I'm facing is that the code only uploads two waves wave0 and wave1 and not all the files from the folder.

#pragma rtGlobals=3 // Use modern global access method and strict wave access.



// Get the folder path.

Menu Reactor;

Load Reactor, LoadDataFromCSV()

End



Function LoadDataFromCSV()

string folderPath

string fname

string wname

string sname

variable i

getfilefolderinfo/D

newpath/O GCFolderData S_path

string fileList= indexedfile(GCFolderData,-1,".csv")

do

//store the ith name in the list into wname.

fname = stringfromlist(i,fileList)




//!!!!!!!!!! change the next line if you want a different name for the waves that are created !!!!!!!!!!!!!!!

wname = fname

sname = stringfromlist(i,filelist)

wave wave0 = $wname

wave wave1 = $sname



//if the referenced wave does not exist, create it.

if (!waveexists(wave0)&!waveexists(wave1))



//The /L parameter tells IGOR to load no headers, and to load the 3rd column of data (indexed as 2) only

//!!!!!!!! You must change this next line to tell IGOR how to load the data in each file !!!!!!!!!!!!!!!

LoadWave/J/N=wave/P=GCFolderData/O/L={0,0,0,0,0} stringfromlist(i,filelist)

LoadWave/J/N=wave/P=GCFolderData/O/L={0,0,0,1,0} stringfromlist(i,filelist)

print "Loaded "+fname

rename wave0 $wname

rename wave1 $sname



else

print fname+" was previously loaded. Its corresponding wave exists."

endif

i += 1 //move to next file

while(i<itemsinlist(filelist)) //end when all files are processed.

end



End

 

 proceduretest.ipf

Execute this Igor command to see a help topic that might help with the "all the files" part of the problem: DisplayHelpTopic "Loading All of the Files in a Folder"

Then add to it the graphing part of the problem. You may wish to examine other examples within that help file.

February 7, 2024 at 10:19 am - Permalink

 

Menu Reactor;

Load Reactor, LoadDataFromCSV()

End

Here you need quotes around the strings

fname = stringfromlist(i,fileList)

// - snip -

wname = fname

sname = stringfromlist(i,filelist)

in these lines you set fname, wname and sname to the same value.

if (!waveexists(wave0)&!waveexists(wave1))

& is a bitwise operator. In this instance it will work, but better to use && where you mean logical AND.

wave wave0 = $wname

if there is a chance the wave does not exist, use wave/Z

LoadWave/J/N=wave/P=GCFolderData/O/L={0,0,0,0,0} stringfromlist(i,filelist)

LoadWave/J/N=wave/P=GCFolderData/O/L={0,0,0,1,0} stringfromlist(i,filelist)

print "Loaded "+fname

rename wave0 $wname

rename wave1 $sname

Here you use the /N=basename and the /O (overwrite) flag. Consider instead using the /A flag and extracting the wavename from S_waveNames in order to build your rename operation.

I suggest:

LoadWave/J/A/P=GCFolderData/L={0,0,0,0,2} stringfromlist(i,filelist) // load two columns into two waves

// check for success here

rename $StringFromList(0, s_wavenames) $wname
rename $StringFromList(1, s_wavenames) $sname

There may be other errors, these are what caught my eye.

Don't be afraid to experiment with the debugger early in your programming adventures!

execute DisplayHelpTopic "The Debugger"

February 7, 2024 at 11:06 am - Permalink