[SOLVED] how to get the sum of the difference of an output and a data set

[shegmite]

Please i need hint on how to manipulate the output from a for loop do summation of differences between that output and a data set. An example is shown below. I tried it but it only computed the sum for the first for loop neglecting the other data set.

  for f = [1   4    8    10   14];
    b=2;
    c=1;
    d=1;
    n=4;
    N= f*b*c*d;
    M=[4.5    10.5   20.5   25.6   30.8];
    Y = (M-N);
    A = sum(Y);
  end
  disp(A)

 

[D.A.(Tony)Stewart]

initialize all variables to zero
A=A+Y

You can do in a spreadsheet too.

 

[albbg]

I didn.t understand what exactly you want to do. I don't think you need a for loop.
I modified your original code to the following:

f = [1 4 8 10 14];
b=2;
c=1;
d=1;
n=4;
N= f*b*c*d;
M=[4.5 10.5 20.5 25.6 30.8];
Y = (M-N);
A = sum(Y);
disp(A)

you'll have

f(1)=1
f(2)=4
f(3)=8
f(4)=10
f(5)=14

then

N(1) = 1*b*c*d
N(2) = 4*b*c*d
N(3) = 8*b*c*d
N(4) = 10*b*c*d
N(5) = 14*b*c*d

doing the calculation, the following error will be calculated:

Y(1) = 2.5
Y(2) = 2.5
Y(3) = 4.5
Y(4) = 5.6
Y(5) = 2.8

but if you sum all this values of course you'll get a single value that is 17.9.

Is this what you expected ?

 

[shegmite]

To subtract the output of a for loop manipulation sequentially from a data set

[MODERATED] Thread duplicated, merged with the above


Please i need hint on how to make the output of this for loop (N) to be subtract from M sequentially without skipping any of the numbers. I tried this code and it did not give me the correct answer as it ignored some numbers.

for f = [1   4   8   10  14  18   22  26  30  34  38  42  45  48   52];
    b=2;
    c=1;
    d=1;
    N= f*b*c*d;
end 
M=[4.5  10.5   20.5   25.6  30.8  34.6  35.8  38.4  17.2   18.5  20.5  22.6  24.5  26.6 28.9];
Y = (M-N);
A = sum(Y);
disp(A)

 

[D.A.(Tony)Stewart]

Re: To subtract the output of a for loop manipulation sequentially from a data

I assume you know the basics of MATLAB.

If not write your problem by explicit example, rather than force us to assume we know what you are doing or know what you want.

https://www.maths.uq.edu.au/department/computing/matlab/

 

[andre_luis]

Re: To subtract the output of a for loop manipulation sequentially from a data

The first row of the code above do not seem a typical MATLAB construction for a loop.

Anyway, once this thread duplicates another recent discussion that shegmite created having the same subject, this one will be closed. Please refer to this :
how to store horizontally the output of a multiplication for subtraction later