@groovyda wrote:
Hi - I’m new to Julia, been playing around a bit. I’ve been struggling to understand the below. I have some code where I need to switch some values in an array. I get (surprisingly) different results if I use
w[3], w[2] = w[2], w[3] vs. w_copy = copy(w) w_copy[3], w_copy[2] = w_copy[2], w_copy[3] # or w_copy[3], w_copy[2] = w[2], w[3]Note this is being run in a large for loop, where w3 is being inititalised along with other similar arrays.
This seems to give the correct results:
for m1 in all_prefs, m2 in all_prefs, m3 in all_prefs, w1 in all_prefs, w2 in all_prefs, w3 in all_prefs w1_p1 = f([m1,m2,m3], [w1,w2,w3])[1] w2_copy = copy(w2) w2_copy[2], w2_copy[3] = w2_copy[3], w2_copy[2] w1_p2 = f([m1,m2,m3], [w1,w2_copy,w3])[1]But the below gives different results, which doesn’t seem correct:
for m1 in all_prefs, m2 in all_prefs, m3 in all_prefs, w1 in all_prefs, w2 in all_prefs, w3 in all_prefs w1_p1 = f([m1,m2,m3], [w1,w2,w3])[1] w2[2], w2[3] = w2[3], w2[2] w1_p2 = f([m1,m2,m3], [w1,w2,w3])[1]Why should this be? Please help
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