Why i got this error Undefined function or variable 'famp'.

delt=0.005

delt =

    0.0050

>> s=2.384e-7

s =

   2.3840e-07

>> x=load('AA01.HNE.2013.106.10.39.00');x=detrend(x)*s;plot(x) >> y=load('AA01.HNN.2013.106.10.39.00');y=detrend(y)*s;plot(y) >> z=load('AA01.HNZ.2013.106.10.39.00');z=detrend(z)*s;plot(z) >> whos Name Size Bytes Class Attributes

delt          1x1                  8  double              
s             1x1                  8  double              
x         21900x1             175200  double              
y         21900x1             175200  double              
z         22000x1             176000  double

>> z=z(1:21900); >> m=[x,y,z]; >> whos Name Size Bytes Class Attributes

delt          1x1                  8  double              
m         21900x3             525600  double              
s             1x1                  8  double              
x         21900x1             175200  double              
y         21900x1             175200  double              
z         21900x1             175200  double

>> [fm,f]=famp(m,delt); Undefined function or variable 'famp'.

Did you mean: >> [fm,f]=damp(m,delt);

[khalifa alebri]

I mean by famp frequency Amplitude

[khalifa alebri]

all the data in the same directory, FYI the MATLAB is a trial Version and I think its full version with all the functions

Answer 1

[YT]

Well in general, it would seem like that you either call a function 'famp' which doesn't exist as a build-in Matlab function (therefor Matlab gives you a suggestion of a build-in function that does exist which is 'damp') or 'famp' is a function you created on your own but it's not in the same directory/environment (or on the Matlab path, like Stephen pointed out).

EDIT

path %check path
addpath('C:\user\my directory') %add to path

[Stephen23]

"ut it's not in the same directory/environment as your main file."

It does not need to be in the same directory, just anywhere on the MATLAB path will do perfectly.

[YT]

Well sure, but then you need 'addpath()' if you haven't specified it already. I agree it's easier to do that. I'll edit my statement.