Why there is a Invalid Expresssion error in my fit function?

I wrote this simple code

n = [1433;2700;1000000];

s = [1170.98;780.65;390.33];

f= fit(n,s,'power1')

But the error said "invalid expression. check for missing or extra characters"

I'm not very used to Matlab and I absolutely have no idea why this error occurs.

Ofc, I installed Curve Fitting Toolbox

Answer 1

[the cyclist]

Your code works:

n = [1433;2700;1000000];
s = [1170.98;780.65;390.33];
f= fit(n,s,'power1')

f = 
     General model Power1:
     f(x) = a*x^b
     Coefficients (with 95% confidence bounds):
       a =        3511  (-3.081e+04, 3.783e+04)
       b =      -0.167  (-1.38, 1.046)

Did you perhaps try to spread that code across multple lines? You might need to use line continuation, if so.

[Hyeon Soo Lee]

Thanks for replying! I just recognized this additional error message

"Error: File: fit.m Line: 1 column: 3"

I don't get it. What's up with that fit.m? Is it related with your answer?

[the cyclist]

It's difficult to understand what is going on with your code, when it works perfectly fine here.

Do you get this problem from a freshly restarted MATLAB session? How are you calling these lines of code?

Are you sure you have the CF toolbox installed? What do you get if you type

which -all fit

from the command line?

[Hyeon Soo Lee]

Problem solved. Seems like my labtop was gone crazy for a while. It works fine now. Thanks for the help btw.