how to get the index from the plot for a specific condition

Here is my code:::::

myX = [4453,5157,1,2302,191,1294,402,4340,1,2145,1,705,1322,1450,1210,1310,1209,1300,1475,1603];

threshold = 1200;

plot(myX)

I need to store the index of values which is greater than 1200.

like

myans = [1,2,4,6,8,10,13,14,15,16,17,18,19]

any idea..

Answer 1

[KSSV]

idx = myX>1200 ;  % logical indexing
myX(idx)
idx = find(idx)

[Saravanakumar Chandrasekaran]

It works well... Thank u