Infimum

Share icon

Hi all,

I was just wondering if there is a function or so in Igor that can be used to calculate the infimum of a set of numbers given a particular value.

For example in the following code, Im trying to find the numbers in my wave that are < 1 and > 9. After having found the set of numbers for each category, I was hoping to find the infimum from that, and I was wondering if there is a particular function for that.

The two for loops pretty much define the sets of numbers. For the first for loop, i want to find the infimum of its set of numbers < 1, and for the second for loop I want to do the same with set of numbers > 9.

Any tips or suggestions?
Function Auxiliary(inwave1)
    Wave inwave1
    variable crossing0
    variable crossing 1
 
    crossing0 = 1
    crossing1 = 9
 
//...(I will skip to the for loops)
 
for (i=0;i<numPoints;i+=1)
   if(inwave1[i]<crossing0)
     print i 
     count0 += 1
   endif
endfor
 
for (j=0;j<numPoints;j+=1)
   if(inwave1[j]>crossing1)
     print j
     count1 += 1
   endif
endfor
return count0
return count1
I am going to ignore the code snippet above because I am not sure what it means.

A simple way to "find members" as you describe above is to use the Extract operation. Here is an example (from the documentation):

Make/O source= x
Extract/O source,dest,source>10 && source<20


Now if you want to find the minimum or maximum value of this subgroup simply execute:
Print WaveMax(dest)
Print WaveMin(dest)


I hope this helps,

A.G.
WaveMetrics, Inc.

May 29, 2013 at 03:39 pm - Permalink

igorman wrote: 

return count0
return count1



Just a comment: Be aware that the function stops executing immediately once you hit a return statement, so the value of count1 will never be returned.

May 30, 2013 at 12:49 am - Permalink