problem with fit function for data

I have a problem with getting the fit function to work

clear; clc;

E = [416.861, 818.7, 1097.3, 1293.54,1507.4];

e = flip([1.7e-1, 1.6870e-1, 2.045e-1, 1.956e-1, 6.255e-1]);

f = fit(E,e,'exp1');

plot(f,E,e,'rx','markersize',8)

grid on

this gives me this error:

Error in fit (line 116)

[fitobj, goodness, output, convmsg] = iFit( xdatain, ydatain, fittypeobj, ...

Error in Untitled2 (line 6)

f = fit(E,e,'exp1');

No idea why this happens, and I do have ethe curve fitting toolbox installed.

Answer 1

[Star Strider]

The fit function requires column vector arguments. Force that sith the ‘(:)’ subscript noitation.

E = [416.861, 818.7, 1097.3, 1293.54,1507.4];
e = flip([1.7e-1, 1.6870e-1, 2.045e-1, 1.956e-1, 6.255e-1]);
f = fit(E(:),e(:),'exp1');
hp = plot(f,E,e,'rx');
hp(1).MarkerSize = 8;
grid on

The other problem is that the 'MarkerSize' is ambiguous here, since both the data and fit are plotted, so use that as a separate assignment and reference the appropriate line object.

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[Nirvan Hashemian]

Thank you!

[Star Strider]

As always, my pleasure!

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