Merge pull request #25 from maanikmarathe/maanikmarathe-closest-srcs-…

…helper

Add helper function closest_srcs

src/helper.jl

@@ -30,4 +30,22 @@ function convert(eeg, onsets, design;reshape=true)
 
 end
 
-
+"""
+Takes an array of 'm' target coordinate arrays (1-by-3) and a matrix (n-by-3) of all available positions, and returns an array of size 'm' containing the indices of the respective items in 'pos' that are nearest to each of the target coordinates.
+"""
+function closest_srcs(coords_list, pos) 
+	out = [];
+	s = size(pos);
+	dist = zeros(s[1]);
+	diff = zeros(s[2]);
+	for coords in coords_list
+		for i=1:s[1] 
+			for j=1:s[2]
+				diff[j] = pos[i,j] - coords[j];
+			end
+			dist[i] = norm(diff);
+		end
+		push!(out,findmin(dist)[2]) #retain only the index of the minimum difference.
+	end
+	return out
+end