I want to Add different values to all the elements of a column vector succesively.., plz help me out

for example: I have a column vector as [1200 1260 1320 1380 1440 1500 1560 1620......] I want to add a value 0 to 1200, 15 to 1260, 30 to 1320,45 to 1380 then again 0 to 1440, 15 to 1500, 30 to 1560, 45 to 1620...... and so on, such that only 4 values have to be added to a big column of infinite elements, but repeatedly.., plz help me come out

Answer 1

[Stephen23]

This is easy using mod, no loops are required (and would be slow and inefficient anyway):

>> X = [1200;1260;1320;1380;1440;1500;1560;1620]
X =
   1200
   1260
   1320
   1380
   1440
   1500
   1560
   1620
>> V = 15*mod(0:numel(X)-1,4);
>> X+V(:)
ans =
   1200
   1275
   1350
   1425
   1440
   1515
   1590
   1665

[Mohammed Yousuf]

It works, Thank you

Answer 2

[KSSV]

a = [1200 1260 1320 1380 1440 1500 1560 1620] ;
a0 = [0 15 30 45 0 15 30 45] ;
N = length(a) ;
iwant = zeros(N,4) ;
for i = 1:N
    iwant(i,:) = linspace(a0(i),a(i),4) ;
end
iwant =  reshape(iwant',[],1)

[Mohammed Yousuf]

showing error as index out of bounds because numel(a0)=8

[Mohammed Yousuf]

my matrix a is very big like: some 100000 elements in it, i want to add 0 to first element 15 to second, 30 to third, 45 to fourth and again 0 to the fifth 15 to the sixth 30 to the seventh and 45 to the eighth and so on....

[KSSV]

You want to add or insert middle values?