How to extract data from matrix for calculations in Lumerical Script

- August 27, 2022 at 2:37 pm
  
  megan.obrien
  Subscriber
  
  Hi,
  I have calculated and saved to a text file the data for both neffTM and neffTE for varying fill factor of a grating coupler. I want to load this data into another Lumerical script and use it for calculating the different pitch values required.
  The lines of code I have used to load the textfile into the script is as follows:
  M = readdata("textfile.txt");
  And the data is then loaded as a [17,3] matrix called M into the script workspace. I need to access the 2nd and 3rd columns for the pitch calculations, as te 2nd column is the neffTM values and the 3rd column is the neffTE values.
  However, I am failing to access them as it is. Can anyone help me out please?
- August 29, 2022 at 5:12 pm
  
  Guilin Sun
  Ansys Employee
  
  Here is an intro about matrix https://optics.ansys.com/hc/en-us/articles/360034929613-matrix-Script-command
  Since this is a 2D matrix, you can access it as
  neffTM=M(n,2);
  neffTE=M(n,3)
  where n is the index for fill factor., eg, n=1
  you have the first value of the fill factor M(1,1); and neffTM and neffTE are the correspodent neff for this fill factor.
  Please try and compare your original data.