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Linear regression - how to plot at specified locations

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hde
hde 2012-8-27
I have a vector of basis/spline locations that I want to use to plot a piecewise linear regression to.
I have
y_i=B*beta + error.
B is a design matrix that calculates the time point in the data minus the knot location (each theta) when the differene is positive (x_i-theta_i)_+ , for each n data points.
How do I actually proram this in MATLAB? I want to plot y against x, where the linear regression changes at each theta?
Any help in the right direction would be much appreciated.

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