how can i check if a cell is equal to summation of other cells?

Dear All, I have a matrix of 5 columns and many rows, the first column A is the total weight of a car, the rest of the four columns are the individual weight each wheel carries, as a quality check, I need to check if every cell in the 1st column is really equal to the summation of the last four columns B to E, and if not delete this row because it will corrupted data, how can I do that in matlab? is there any (is equal) thing?

Answer 1

[the cyclist]

One should not check floating-point numbers for exact equality, due to possible error in exact representation. Here is a simple method that will check for equality within a tolerance you define.

% The data
M = [3 1 2;
     4 1 3;
     6 1 4];

% Define a tolerance for equality
tol = 1.e-6;

% Test for equality within tolerance
abs(M(:,1)-sum(M(:,2:end),2)) < tol;

[MAHMOUD ALZIOUD]

this is a brilliant idea, i will try it now

[MAHMOUD ALZIOUD]

i have a question please, what do you mean by 2 in the last line ? the last 2 in the line what is it for?