Determine first and second derivatives, without using builtin diff function, using forward differencing with 0 dx error

% Set the range of x values for the function
dx = 0.1;
x = 0:dx:8;

% calculates the value of f using a given function
f = Wave1(x);

% Initialize the derivative vectors as nan arrays the same size as x.
% You must keep the variable names "dfdx" and "d2fdx2"
dfdx = 
d2fdx2 = 

% Use a loop to find the first derivatives (but not the built in diff() function).
% You may also delete the loop structure beginning and find the derivative using vector operations 
for i = 
end

% Find the second derivative.
for i = 
end

[darova]

Where is the problem?

[Steven Lord]

This sounds like a homework assignment. If it is, show us the code you've written to try to solve the problem and ask a specific question about where you're having difficulty and we may be able to provide some guidance. The code you've posted so far seems like a framework that your professor has given you where he or she expects you to fill in a few steps.

If you aren't sure where to start because you're not familiar with how to write MATLAB code, I suggest you start with the MATLAB Onramp tutorial (https://www.mathworks.com/support/learn-with-matlab-tutorials.html) to quickly learn the essentials of MATLAB.

If you aren't sure where to start because you're not familiar with the mathematics you'll need to solve the problem, I recommend asking your professor and/or teaching assistant for help.

Answer 1

[Ridwan Alam]

dfdx = zeros(size(f));
d2fdx2 = zeros(size(f));

dfdx(2:end) = f(2:end)-f(1:end-1);

d2fdx2(2:end) = dfdx(2:end) - dfdx(1:end-1);

Answer 2

[lilo moutila]

Did you find the loop for this one ?