Update url

Author: hasanisaeed

README.md

@@ -1,5 +1,5 @@
 # Recurrence Plot
-[Recurrence Plot](http://www.recurrence-plot.tk/glance.php#:~:text=Recurrence%20plot%20%E2%80%93%20A%20recurrence%20plot,a%20certain%20pair%20of%20times) – A recurrence plot (RP) is an advanced technique of **nonlinear** data analysis. It is a visualisation (or a graph) of a square matrix, in which the matrix elements correspond to those times at which a state of a dynamical system recurs (columns and rows correspond then to a certain pair of times).
+[Recurrence Plot](https://en.wikipedia.org/wiki/Recurrence_plot) – A recurrence plot (RP) is an advanced technique of **nonlinear** data analysis. It is a visualisation (or a graph) of a square matrix, in which the matrix elements correspond to those times at which a state of a dynamical system recurs (columns and rows correspond then to a certain pair of times).
 
 # Result
 ![](results/1D_to_2D.jpg)