How to concatinate two intervals in a vector?

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sH
sH 2015-6-12
编辑： Image Analyst 2015-6-13
Hello How to construct this vector? b ∈[−3e10, −10e10]∪[10e10,30e10]
  2 个评论
James Tursa
James Tursa 2015-6-12
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
sH 2015-6-12
编辑：Image Analyst 2015-6-12
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?

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回答（2 个）

Star Strider
Star Strider 2015-6-12
编辑：Star Strider 2015-6-12
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.)
Image Analyst
Image Analyst 2015-6-12
编辑：Image Analyst 2015-6-13

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])

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