Generated code that mulitples previous number

Hello I want to compute a value assuming Xo = 1

using the formular X = e * (p) . ^ ( e - 1) * X

for first X = e * (p) . ^ ( e - 1) * Xo

Second X = e * (p) . ^ ( e - 1) * X1

Third X = e * (p).^(e - 1) * X2

fourth X = e * (p). ^ (e - 1) * X3

it can be simplified

X0 = 1

X1 = e * (p) . ^ ( e - 1) * Xo

X2 = e * (p) . ^ ( e - 1) * X1

X3 = e * (p) . ^ ( e - 1) * X2

X4 = e * (p) . ^ ( e - 1) * X3

Can anyone assist me in generating this code

Thanks in advance

Regards

Tino

Answer 1

[Stephen23]

I specified:

e = 1.2;
p = 2.3;

and then your code produces:

X0 =
     1
X1 =
       1.4175
X2 =
       2.0093
X3 =
       2.8483
X4 =
       4.0375

Simpler MATLAB code using power:

>> (e*p.^(e-1)).^(0:4)
ans =
            1       1.4175       2.0093       2.8483       4.0375

or cumprod (as Steven Lord suggested):

>> cumprod(e*p.^(e-1)*ones(1,4))
ans =
       1.4175       2.0093       2.8483       4.0375

[Tino]

Thanks for yout answer.

I am doing this for n numbers of any size

hope to hear from you soon

thanks in advance

Tino

[Stephen23]

"I am doing this for n numbers of any size"

Of course, it is trivial to change the vector sizes:

(e*p.^(e-1)).^(0:4)
%                ^ change this!
cumprod(e*p.^(e-1)*ones(1,4))
%                         ^ change this!

[Tino]

Thanks for your answer and your patient with me Stephen

Another question

I have the following matrices [m{:}] representing p

when I implemented it using the

ccv, mi] = size(m);
disp(size(m))
disp(m);
e = 0.92;
nnn = e * [m{:}].^(e - 1) ;
X = cumprod(e * [m{:}].^(e - 1)).* ones(1, ccv);

I get error for the arrays

Please can you see if I am doing anything wrong

Thanks in advance

Tino

[Stephen23]

If p is non-scalar then those methods are not suitable. You should simply use a loop and indexing.

[Tino]

Can you assist me with a loop pls?

if not then you ve done your best and I appreciate it

Regards

[Stephen23]

e = 1.2;
p = [3,4;5,6];
N = 5;
C = cell(1,N);
C{1} = 1;
for k = 2:N
    C{k} = e*p.^(e-1) * C{k-1};
end

Giving:

>> C{:}
ans =  1
ans =
   1.4949   1.5834
   1.6557   1.7172

ans =
   4.8563   5.0860
   5.3181   5.5703

ans =
   15.680   16.423
   17.172   17.986

ans =
   50.631   53.029
   55.449   58.076

[Tino]

thanks Stephen. I appreciate

Answer 2

[Steven Lord]

Use the cumprod function. [Don't make individually numbered variables, store them as elements of one vector.]

[Tino]

Thanks Steve

I have done this but not working

e = 0.92;

nnn = e * P.^(e - 1);

for j = 1 : kol

X{j} = cumprod(nnn);

end

But not working how do I go about it