How to insert an element after each number in a vector?

Dear all,

I would like to add an element after each value in a vector, for example:

a=[10,2,40,58,100,90,40,30,4];

I would like to add 1 to vector values:

result = [1,10,1,2,1,40,1,58,1,100,1,90,1,40,1,30,1,4,1];

Help me please.....

[Image Analyst]

Instead of "after each number" don't you mean "after each number, EXCEPT the first number, where the number is also before the first number?" That's what Star and Adams solutions do. Or do you really mean what you said, instead of the "result" you gave, and so there would be no 1 at the beginning?

Answer 1

[Star Strider]

One approach:

a=[10,2,40,58,100,90,40,30,4];
result = [ones(size(a)); a];
result = [result(:); 1]'

producing:

result =
	1	10	1	2	1	40	1	58	1	100	1	90	1	40	1	30	1	4	1

[KALYAN ACHARJYA]

Nice +1

[Star Strider]

@KALYAN — Thank you!

[laith Farhan]

Super thanks Star Strider. It is really nice solution.

Thanks a lot guys for your solution and suggestion, I really appreciate that.

[Star Strider]

As always, my pleasure!

Answer 2

[Adam Danz]

result = [reshape([ones(size(a));a],length(a)*2,1);1]';

[Adam Danz]

Ha! Looks like Star Strider and I replied at the same time with nearly the same solution.

[KALYAN ACHARJYA]

Nice one, +1, I tried, but can't

[laith Farhan]

Thanks Adam Danz. I really apprecaite your help.

Answer 3

[Image Analyst]

Instead of "after each number" did you mean "after each number, EXCEPT the first number, where the number is also before the first number?" That's what Star and Adam's solutions do. Or do you really mean what you said, instead of the "result" you gave, and so there would be no 1 at the beginning?

Just to be complete and cover all ambiguities, I'll give the other solution. If you really want what you said in words, rather than the numerical result you gave, then use this code:

result = [a; ones(size(a))]
result = result(:)'

The result is:

result =

10 1 2 1 40 1 58 1 100 1 90 1 40 1 30 1 4 1

Note: 1's are only after the numbers and not before the first one.

[laith Farhan]

Thanks Image Analyst, yes, it might help me for another cases.