How to change LineWidth and MarkerSize in plot fit curve ?

I am using this code in order to plot my data.

The problem is that I can not change the size and the linewidth of my plot.

I used this

filename='final.txt'

d1= importdata(filename);
x=d1.data(:,1)
y=d1.data(:,2)

f=fit(x,y,'poly1')
plot(f,'r--',x,y,'b^','MarkerSize',10);

But no use. The problem is in command

plot(f,'r--',x,y,'b^','MarkerSize',10);

Command window shows

Error in test_trendline (line 17)

plot(f,'r--',Distance,IMM,'b^','MarkerSize',10);

Could you please help me?

Answer 1

[KALYAN ACHARJYA]

Can you try this way?

figure,plot(f,'r--');
hold on;
plot(x,y,'^b','MarkerSize',10);

May be because of different class, here 'f' is cfit class

[Ivan Mich]

What about the linewidth? This code you give me grows only the markersize. What about the fit curve?

[KALYAN ACHARJYA]

Set the linewidth as you want

fig=plot(f,'r--');
set(fig,'lineWidth',2);
%.................. ^
hold on;
plot(x,y,'^b','MarkerSize',10);