How do multiply all elements inside a for loop by an array

basically I want to solve this: I have the array a c= a*b where a =2 and b =[1 2 3] so c =[ 2 4 6] I want to multiply each element of c by another array called d= [ 10 20 30]. Obviosuly the arrays are of different sizes so I can't seem to get it to work. The result I want to get is this: three arrays, each element of c multiplied to d

y = [20 40 60] [40 80 120] [60 120 180]

my code so far is this: clear all close all

a=2 b= [1 2 3]

d=[ 10 20 30]

for i=1:length(b)

    c(i)=a*b(i);
    for j=1:length(d)
        y(j)=c*d(j);
    end
end

Answer 1

[Robert Cumming]

a=2;
b= [1 2 3];

d=[10 20 30];

c=a*b;
y=zeros(3,3);
for ii=1:length(c)
  y(ii,:) = d(ii)*c;
end

[Bruno]

alright cool this kinda works but the answer is in a matrix, but how can i get the answer as three arrays that the for loop throws out such as:

y(1)=[20;40;60]

y(2)=[40;80;120]

y(3)=[60;120;180]

thanks!

[Robert Cumming]

what you've written is not possible. You cant put 3 numbers into a single elemnt. The closest you can get is to use cell arrays.

initialise by yy=cell(3,1)

and in the loop use yy{ii} = d(ii)*c

Note: cell arrays are indexed by curly brackets {}

Answer 2

[Matt Fig]

c = [2 4 6];
d = [10 20 30];
y = bsxfun(@times,c.',d)

Or if you really must have a cell array:

y = arrayfun(@(x) times(x,d),c,'Un',0);

Not use cell indexing to get at each vector:

y{1}
y{2}
y{3}

Answer 3

[Andrei Bobrov]

y = b'*d*a