MATLAB: Matrix Indexing for calculating slope

MATLABmatrix manipulation

Ive got 2, 31×1 matrices x and y to represent x and y points

Id like to calculate the slope of the data by using m = y2 – y1/x2 – x1 and average the slopes obtained

My question is how can i use the second and first value of data of both x and y to calculate the slope for each point throughout the whole data set

Best Answer

slope=diff(y)./diff(x);
averageSlope=sum(slope)/length(slope);

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aurc89 - find the indices of x1 and x2 within your x vector and then fit the curve against x and y using these indices. For example, if idx1 and idx2 are the indices of x1 and x2 such that x(idx1)==x1 and x(idx2)==x2 then fit the curve between these two points as

 fit(x(idx1:idx2),y(idx1:idx2),'gauss2')

MATLAB: Matrix divison or calculating slope

There is a syntax error with your use of parentheses. Also, the slope for the last row is not defined. This should work:

nrows = 3;  % Set nrows to 12 for your full data set
slope=zeros(nrows-1,6);
for i=1:nrows-1 
  for j=1:6 
      slope(i,j)= (hc(i,j)-hc(i+1,j))/(tc(1,j+1)-tc(1,j));
  end
end

Best Answer

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