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% This function interpolates data returned from the runLTspice function so
% as to make the time vector evenly spaced.
% example usage:
%   asc_file = 'filename.asc';
%   volt_curr_list =  runLTspice(asc_file);
%   results = runLTspice(asc_file, volt_curr_list);
%   fs = 10000;
%   interp_results = interpLTspice(results, fs); 
% By David Dorran (david.dorran@dit.ie)
function data_struct = interpLTspice(data_struct, fs)
%check if the data is structured as expected
data_ok = 0;
    data_ok = 1;
    if ~(isfield(data_struct,'data') && isfield(data_struct,'data_name') && isfield(data_struct,'time_vec'))
        data_ok = 0;
    error('The variable passed to this function is not a data structure returned from runLTspice and cannot be processed')

if~(isnumeric(fs) && length(fs) ==  1 && fs > 0)
    error('The second parameter used in this function should be a positive number representing the sampling frequency')

try t = data_struct.time_vec(1):1/fs:data_struct.time_vec(end);
    error(sprintf('A sampling rate of %f resulted in too much data (memory limits exceeded).\n\nTry a different sampling frequency using interpLTspcice(data_struct,fs);', fs));
for k = 1:length(data_struct.data)
    data_struct.data{k} =  interp1(data_struct.time_vec, data_struct.data{k}, t);
data_struct.time_vec = t;

  1. Naeem
    December 9, 2015 at 2:29 pm

    Would you please provide a code that can be run in Mac? The Mac version of LTspice is out there and it runs perfectly, but when I run these codes the error “The LTspice execuatble scad3.exe could not be found in C:\Program Files\LTC\LTspiceIV\. Once the correct location is entered it will be recorded for future use of this function.”

    • December 10, 2015 at 6:56 am

      I’m afraid I don’t own a Mac so I’m not in a position to do this.

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