The problem of plotting

I make a curve fitting selection for a set of points and build a graph that includes: a set of points for which the fitting is performed(f), a fitted curve(dv,tv) and another set of points(mlbt1, mlbt2). But for some unknown reason, the schedule is not being built. How can this be fixed?

P.s. I have attached all the data files to the question.

My code:

load tv
load dv
load mlbt1
load mlbt2

t_v = tv';
d_v = dv';
f = fit(d_v,t_v,'rat55'); 

Warning: Start point not provided, choosing random start point.

plot(f, mlbt1, mlbt2,'o', dv,tv,'-b');

Error using cfit/plot>parseinput
Argument 6 is incorrect

Error in cfit/plot (line 46)
[S1,xdata,ydata,S2,outliers,S3,ptypes,conflev] = parseinput(alltypes,varargin);

grid on

Answer 1

[the cyclist]

A quick look at the documentation for fit suggests to me that you syntax you used (to include two plots in one figure) is not valid. Try this instead. (I'm not certain this exact plot is what you intended, but I'm guessing you can edit to get what you wanted.)

load("dv","dv")
load("tv","tv")
load("mlbt1","mlbt1")
load("mlbt2","mlbt2")

t_v = tv';
d_v = dv';
f = fit(d_v,t_v,'rat55'); 

Warning: Start point not provided, choosing random start point.

figure
hold on
plot(f, mlbt1, mlbt2,'o');
plot(dv,tv,'-b');
grid on

Answer 2

[Walter Roberson]

When you plot() a cfit object https://www.mathworks.com/help/curvefit/cfit.plot.htm then you cannot specify multiple datasets to plot.

plot(f, mlbt1, mlbt2,'o'

that part would correspond to the syntax

plot(cfit,x,y,DataLineSpec)

In order to have more parameters after that, you would have to be using

plot(...,ptype,level)

but ptype for that syntax is a character vector or scalar string object, which your dv is not.

If you want to plot tv vs dv on the same line you will need to

plot(f, mlbt1, mlbt2,'o');
hold on
plot(dv,tv,'-b');
hold off