Errors for the slope and intercept

How can I get the uncertainty for the slope and intercept when using this code

Const = polyfit(log10(x),log10(y), 1);
m = Const(1);
k = Const(2);
b_fit = (10^k) * (x.^m4);

Answer 1

[Walter Roberson]

use the two output form of polyfit and the two output form of polyval

[Walter Roberson]

is the error to be estimated in log10 space or original space ?

[Marisabel Gonzalez]

log10 space

[Walter Roberson]

okay so when you call polyval pass in log10 of the x locations and the second output will reflect that log space .

Answer 2

[Star Strider]

Consider the File Exchange contribution polyparci (link).