This is driving me crazy, I'm just trying to fit a gaussian curve to some data using Matlab's fit function (r2017a).
gaussEqn = 'a*exp(-((x-b)/c)^2)+d'
f = fit(x,y,gaussEqn);
But I get this error:
Error using fit>iFit (line 340)
Invalid data type. Second argument must be numeric or logical.
Yet my variables are both numeric...
whos x
Name Size Bytes Class Attributes
x 101x1 808 double
and
whos y
Name Size Bytes Class Attributes
y 101x1 808 double
Whyyyyy is this happening? At this point, I'll use a different function to fit my data, but it doesn't make any sense (and the internal fitting function iFit is not accessible)
Requested edit:
The x and y variables are time and the mean of a matrix of interest; x for instance:
fs = 1000;
w = .1;
t = (-w:1/fs:0) * 1000; x = t';
The y variable is a bit more complicated, it is the mean of an estimated neural filter, which is computed by a different function that I wrote:
STA = genSTA(find(spkV),NSr(:,:,stimI),w,fs);
whos STA
Name Size Bytes Class Attributes
STA 25x101 20200 double
y = mean(STA,1);
whos y
Name Size Bytes Class Attributes
y 101x1 808 double
