How to extract values from an array?

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Ishita Agrawal
Ishita Agrawal 2020-3-10
回答： Stijn Haenen 2020-3-10
Hello all,
I am trying to extract values from an array using the command given below.
x = 1:0.1:2;
val1 = x(1:4);
val2 = x(1):x(4);
Can anyone tell how val1 is different than val2?
Thanks in advance!

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回答（2 个）

Star Strider
Star Strider 2020-3-10
The default ‘step’ for the colon operator is 1. So ‘val1’ correctly addresses elements 1 through 4.
Since ‘x’ has values from 1 to 2 with a step of 0.1, and since ‘x(1)’ is 1 and ‘x(4)’ is 1.3, the next value after ‘x(1)’ is 2. Since this is greater than 1.3, ‘val2’ returns only the first value in the series, that being ‘x(1)’ or 1.
Stijn Haenen
Stijn Haenen 2020-3-10
val1 contains the numbers x(1), x(2) x(3) and x(4). val2 contains the numbers between x(1) and x(4) with steps on 1, but x(4) is not large enoug to complete the step so only x(1) is in the list

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