Question on the format of 2D curve fit equations in plot

I am using basic curve fitting for the first time in a while and I get a bunch of equations of the form:

y = 6.588e + 06x^2 +4028x - 1.066. Can someone tell me what the "e" is in the first term?

Thanks

Peter

Answer 1

[John D'Errico]

Scientific notation.

6.588e + 06x^2 == 6.588*10^6 * x^2

Note that it is easier and faster to write, and even a bit easier to read once you learn it. This is commonly used all over MATLAB. For example:

x = 2.3*10^12

x = 2.3000e+12

[Walter Roberson]

Also note that it would always be written with no space after the 'e' -- 6.588e+06 not 6.588e + 06

[Peter Cheimets]

Thanks. One note: there was a space in the way it was presented:

[Torsten]

Are you sure it's an official MATLAB program that created the above output ? If yes: which one did you use ?

[John D'Errico]

It looks like the curve fitting TB app just formatted the equation, without using MATLAB to do the work. so someone arbitrarily decided to put a space in there

[Walter Roberson]

Possibly the code is using regexrep() or similar, putting spaces around + and - in the equations, failing to take into account that + and - can occur in scientific notation.

[Peter Cheimets]

That was a snip of the output from the Basic Fitting tool that I got to from the tool menu in Plot in version R2024b on a Mac (maybe I need update). Here is the plot and the output together:

[Peter Cheimets]

Also, now that I look at the image here, I see the version of the equation on the plot itself, and that is certainly clear.

Thanks everyone.

Peter