how to get all the numbers greater than x with positions?

V <- c(1,3,2,4,2,3,1);

X <- 3;
pos <-V[V == X];

pos is 3 3. what I need is the开发者_开发知识库 positions of all 3;

I need 2 and 6; which are the positions of 3 in V.

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Use which

pos <- which(V == 3)

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Not what you're asking for, but useful anyway: you can also use which.min and which.max to find the position of the minimum and maximum value of the array.