Hello everyone. I have a long-standing problem, how to calculate the similarity between the two curves that have been fitted. Thank you for your enthusiastic answers.

corrcoef(f1,f2)

corr2(f1,f2)

[Mathieu NOE]

hi

so nobody to help you ? such a shame !!

I loaded your files and got this - I expected to get the plotted data ?

>> f1

f1 =

6×1 uint32 column vector

3707764736

2

1

1

1

1

>> f2

f2 =

6×1 uint32 column vector

3707764736

2

1

1

1

1

[Wesley]

Thank you very much for your answers. I have uploaded the data file.

[Steven Lord]

What is your definition of "similarity"? Is x1 more similar to x2 or x3? Why?

x1 = 1:5

x1 = 1×5

1 2 3 4 5

x2 = x1 + 1

x2 = 1×5

2 3 4 5 6

x3 = [1:4 7]

x3 = 1×5

1 2 3 4 7

How about x4?

x4 = x1 + (-0.5:0.25:0.5)

x4 = 1×5

0.5000 1.7500 3.0000 4.2500 5.5000

What's most simlar to the black line in the plot below? The cyan with upward pointing triangles, the green with downward pointing triangles, or the magenta with rightward pointing triangles?

plot(x1, x1, 'k-+', x1, x2, 'c-^', x1, x3, 'g-v', x1, x4, 'm->')

[Wesley]

Thank you for your enthusiastic answer.

My defination:

1. Their abscissas have the same starting point and ending point;

2. The slopes of the curves are roughly equal.