MATLAB: Trend lines

fittinglinear regressionplottingtrend line

Hi, I am trying to plot linear trend lines for a number of data sets and determine their respective gradients. Is there any way of doing this without using the 'tools,basic fitting' tab in the figure? Doing this for every plot will be quite time consuming. Sorry, I know this is probably a pretty basic question, but I'm pretty new to Matlab and would really appreciate any help. Thanks Chloe x

Best Answer

Perhaps polyfit() and polyval()?

doc polyfit
doc polyval

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MATLAB: It is possible to use ‘polyval’ with data containing nan

mask = isnan(fice);
t_aa = aa(~mask);
t_fice = fice(~mask);
my_poly = polyfit(t_aa, t_fice, 1);

MATLAB: How to ask MATLAB to predict the next value in a graph

Use polyfit() and polyval():

coefficients = polyfit(t, cost, 1); % Do a linear fit
predictedCost = polyval(coefficients, t); % Get value of linear fit at time t.

Best Answer

Related Solutions

MATLAB: It is possible to use ‘polyval’ with data containing nan

MATLAB: How to ask MATLAB to predict the next value in a graph

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