perform polyfit on a semilogy plot

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Alexander Derrico
Alexander Derrico 2022-10-23
回答： Torsten 2022-10-23
I have 2 sets of data, t_discharge and Volt_discharge. I want to plot t vs volt in a semilog graph where t is x axis and vollt is y axis with log scale. How do I plot a first order line of best fit through this graph and get slope and y-intercept? Thanks!

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Torsten
Torsten 2022-10-23
Ran in:
t_discharge = 837×1
1.0e+00 * 0 0 0 0 0 0.0010 0.0010 0.0010 0.0010 0.0010
A = [ones(numel(t_discharge),1),t_discharge];
b = log10(Volt_discharge);
x = A\b;
semilogy(t_discharge,[Volt_discharge,10.^(x(1)+x(2)*t_discharge)])

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