Please how can I edit/expand data of a text file in Matlab?
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I have a text file with two columns (x1,x2) I do need to expand the data according to the following equations:
x = (x1 + x2)/2 + ((x1-x2)/2)*cos(2Ө) , Ө = -30 :30
y = (x1 + x2)/2 - ((x1-x2)/2)*cos(2Ө) , Ө = -30 :30
xy = ((x1-x2)/2)*sin(2Ө) , Ө = -30 :30
The result would be a new text file has three expanded columns (x,y,xy).
Thanks
6 Comments
Walter Roberson
on 17 Feb 2017
Do you want 61 rows of results for the first row of the file, and the 61 rows of results for the second row of the file, and so on?
Or do you want the results for the entire input file for angle -30, and then the results for the entire input file for angle -29, and so on?
Accepted Answer
Walter Roberson
on 17 Feb 2017
x1x2 = load('p.txt');
ang = -30:30;
nang = length(ang);
X1 = repmat(x1x2(:,1), 1, nang);
X2 = repmat(x1x2(:,2), 1, nang);
ANG = repmat(ang, size(x1x2,1), 1);
X = (X1 + X2)/2 + ((X1 - X2)/2) .* cosd(2*ANG);
Y = (X1 + X2)/2 - ((X1 - X2)/2) .* cosd(2*ANG);
XY = ((X1 - X2)/2) *. sind(2 * ANG);
x = X(:);
y = Y(:);
xy = XY(:);
xyxy = [x, y, xy];
dlmwrite('output.txt', xyxy, ' '); %space as delimiter
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