How can I solve this

write a script that select only odd numbers from random vector of length 10 and its elements between 1 to 20

Answer 1

[Jan]

As usual for homework question, let me encourage you to try it at first by your own an then ask a specific question. The forum will not solve your homework, because this is not useful in a long term of view - neitehr for you nor for the forum.

Start with the definition of "odd": The rest of a division by 2 is 1. The rem or mod function is useful to calculate this.

Then you should extract elements in the range between 1 and 20. (Is this correct? Or should the inputs vector have this range?) Then use "logical indexing" - search in the documentation for these terms, or here in the forum. Note that "1<x<20" is not valid in Matlat, but you need 1 < x & x < 20.

Please try it and then post the code you got so far. When you ask a specific question, the forum will help you: Assistance is fine, posting solutions is not.

Answer 2

[John BG]

Hi Ghada

x=randi([1 20],1,10)

x_odds=nonzeros(x.*mod(x,2))'                % find odd parity values of x
x_odds_locations=find(mod(x,2))

x =
    12    15     1    10    16     8     2     6    14    17

x_odds =    15     1    17

x_odds_locations =     2     3    10

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thanks in advance

John BG

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[James Tursa]

This solution does not work and generates an error because of invalid indexing in x_odds=x(mod(x,2)). Also, since this is obviously homework, it is best in this forum to encourage the poster to make an attempt and offer advice/corrections on his/her attempt rather than giving a complete solution outright.

[John BG]

syntax amended, thanks

John

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