Why my plot is not showing?

Hello, I'm new to matlab. For a homework I need to plot a spline from two vectors.

file = fopen('data_xi.txt');

reel = fscanf(file, '%f', [14]);
fclose(file)

file = fopen('data_yi.txt');

imag = fscanf(file, '%f', [14]);
fclose(file)

xx = 0:.05:8;
yy = spline(reel,imag,xx);
figure(1)
plot(real,imag,'o',xx,yy);

xlabel('Voltage(mV)') ;
ylabel('Current(A)') ;

I'm not sure I understand how spline works, I just copied an example and tried to apply it to my case. When I run the code, the plot window opens but nothing shows up.

Thanks for any help

[Fabricio Macias]

The data_xi has this values :

0.00000000

7.00000003E-02

0.730000019

1.42999995

3.41000009

6.01000023

7.32000017

7.59000015

7.67999983

7.76999998

7.80999994

7.88000011

7.90999985

7.92000008

And data_yi:

745.000000

744.000000

736.000000

729.000000

696.000000

615.000000

460.000000

331.000000

258.000000

187.000000

151.000000

98.5999985

67.5999985

46.4000015

Answer 1

[Ameer Hamza]

The following code works correctly on my system. This was a little type in your code

file = fopen('data_xi.txt');
reel = fscanf(file, '%f', [14]);
fclose(file)
file = fopen('data_yi.txt');
imag = fscanf(file, '%f', [14]);
fclose(file)
xx = 0:.05:8;
yy = spline(reel,imag,xx);
figure(1)
plot(reel,imag,'o',xx,yy);
xlabel('Voltage(mV)') ;
ylabel('Current(A)') ;

The .txt files are also attached.

[Fabricio Macias]

Thank you so much! I can't tell the difference, but at least it works!

[Fabricio Macias]

I found the error, I wrote real instead of reel. Thank you again

[Ameer Hamza]

Yes, reel was the type.

I am glad to be of help!