Hey please i need help with this. if i have these vectors Er=1:3; Ei=0.12.*Er; W=1:0.1:10; how do i generate a vector z based on its relation with W using a for loop in matlab? z={Ei*sin(W) for W<=1 , z={Ei*cos(W) for W>1

Er=1:3;
length(Er)=3;
Ei=0.12.*Er;
W=1:0.1:10;
z={Ei*sin(W) for W<=1
 z={Ei*cos(W) for W>1

[Stephen23]

@babren: please show us the expected output z. Because both Ei and W are non-scalar, it is not clear what you are expecting the output to look like.

Also the condition that you give W<=1 only applies to the very first element of W, which is unusual. Is this intentional?

[babren]

I am sorry if i was not precise. The output should be 3 sets of the vector z (because Ei has 3 values) for each condition with each vector having the same size as W.

[madhan ravi]

See my answer below

Answer 1

[madhan ravi]

Er=1:3;
length(Er)=3;
Ei=0.12.*Er;
W=0:0.1:10; % I suspect W should start from 0 because of the conditions
z=cell(1);
  for i = 1:numel(Ei)
  for j = 1:numel(W)
  if W(j)<=1
  z{i,j}=Ei(i).*sin(W(j));
  else
      z{i,j}=Ei(i).*cos(W(j)) ;
  end
  end
  end
  z ;     %cell array
z =  cell2mat(z) %double array

[Stephen23]

Are nested loops really required for this?

[madhan ravi]

yes they are since the number of elements in Ei and W are not the same

[Stephen23]

"yes they are since the number of elements in Ei and W are not the same"

If nested loops are "required" (which you agree with), then how come I managed to do this two different ways with one and none?

Solving every little problem with lots of (nested) loops is a waste of a high-level language like MATLAB.

I know you can do better than this.

[madhan ravi]

Thank you Stephen but I don't understand

then how come I managed to do this two different ways with one and none? this part?

[Stephen23]

I managed to solve this task once without a loop, and once with just one loop. Both were pretty easy. I am sure that you can do this too, and then you will start showing your skills in MATLAB. Using lots of nested loops is not an effective use of a high-level language like MATLAB.

[madhan ravi]

Ok Stephen will come up with an efficient solution , thank you for cheering up through the journey its truly motivating to excel

[madhan ravi]

@babren if this is what you are looking for make sure to accept the answer else let know what's additionally required

[babren]

thanks for the solution. but i tried it and it gave me cell arrays rather than numbers!!

[madhan ravi]

cell2mat(z) gives you numbers

[madhan ravi]

Did you try it?

[babren]

oh ok thanks!! i will try that.

[madhan ravi]

If it worked make sure to accept the answer so that people know the question is solved