draw a line with known slope and one set of coordinates
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dpb
2020-7-7
m=tan(theta); % tan()=y/x --> slope
b=y1-m*x1; % intercept to pass thru x1,y1 at given slope.
coeff=[m b]; % coefficient array for convenience
yh=polyval(coeff,[x1 xEnd]); % evaluate line from x1 to some end point of choice
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