basic code question

Hello,

If I had two vectors x1 and x2. How could I make vector x3 with all the elements of x2 except the first 3 elements and last 3 elements are from x1?

Many thanks

John

[Oleg Komarov]

Please give a specific title to your questions. Otherwise it's hard to tell wether you're double-posting or not.

Answer 1

[Thomas]

Is this what you wanted?

 x1=1:10
  x2=11:20
  y=[x2(3:length(x2)) x1(1:length(x1-3))]

[John]

Hi,

I meant,

x1=1:10

x2=11:20

then x3 = 1,2,3,14,15,16,17,8,9,10

[Thomas]

y=[x1(1:3) x2(4:7) x1(8:10)]

[Wayne King]

x3 = [x1(1:3) x2(4:end-3) x1(end-2:end)];

[John]

Thanks,

I'm trying to use it in this context but I'm getting an error for y2

Error using ==> horzcat

CAT arguments dimensions are not consistent.

but y1 and y2 are the same length and direction?

Thank you

for k = 1:length(files)

sch_cycle = xlsread(files{k}, 'Input_data');

nrows = size(sch_cycle,1)-1;

x = sch_cycle(:,1);

y = sch_cycle(:,2);

h=3;

N= size(sch_cycle,1);

r=ksr(x,y,h,N)

y1=r.f';

y2 = [y(1:3) y1(4:end-3) y(end-2:end)];

[Oleg Komarov]

Concatenate vertically as I show in my example.

Answer 2

[Oleg Komarov]

If same size:

x1(4:end-2) = x2(4:end-2);

Otherwise:

[x1(1:3); x2(4:end-2); x1(end-2:end)]

Answer 3

[Geoff]

To get all but the last 3, use this:

x1(1:end-3)

You can work out how to get all but the first 3 =)

And you already know how to concatenate vectors.

[Geoff]

Oops, I misread. You want to get the last three only:

x1(end-2:end)