There is probably a better way to do the indexing, but here is my approach.
var = [ 40 30 23 90 89 53 23 123 32 50 21 32 4 65 1 100 64 29 39 293 24 57 97];
pos = 1:numel(var);
value = var(var>50)
index = pos(var>50)
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