How to concatinate two intervals in a vector?

Hello How to construct this vector? b ∈[−3e10, −10e10]∪[10e10,30e10]

[James Tursa]

Concatenate in what way? Have a 4 element output? A 2 element output spanning both? Or what? What would be the desired output for your example?

[sH]

I have written this code and I want this output

[−3e10 : 1e10 : −10e10, 10e10 : 1e10 : 30e10]

I want to know is there a better code?

Answer 1

[Star Strider]

Not certain what you want, but MATLAB has a union operator. Note that it sorts the output:

B = union([-3e10, -10e10],[10e10,30e10])

produces:

B =
  -100.0000e+009   -30.0000e+009   100.0000e+009   300.0000e+009

EDIT — With your new vectors, use union but with a slightly different syntax:

B = union(-30e10 : 1e10 : -10e10, 10e10 : 1e10 : 30e10);

I believe there is an error in your code. The first element of the first vector should be -30e10, otherwise the first element is greater than the last element, and the colon (:) operator will evaluate it as empty. (I corrected it in my edited code.)

Answer 2

[Image Analyst]

You cannot go from -3 to -10 in steps of +1. Did you mean

v = [-3e10 : -1e10 : -10e10, 10e10 : 1e10 : 30e10]

If so, that's a perfectly fine way of constructing that vector.

If there is some overlap in the ranges, then perhaps you might want to run it through unique():

v = unique([-3e10 : -1e10 : -10e10, -10e10 : 1e10 : 30e10])