1 files changed, 45 insertions, 3 deletions
diff --git a/Master/texmf-dist/tex/generic/pst-func/pst-func.tex b/Master/texmf-dist/tex/generic/pst-func/pst-func.tex
index 0bef36090b6..c581b1e49f1 100644
--- a/Master/texmf-dist/tex/generic/pst-func/pst-func.tex
+++ b/Master/texmf-dist/tex/generic/pst-func/pst-func.tex
@@ -1,4 +1,4 @@
-%% $Id: pst-func.tex 861 2018-12-13 20:40:06Z herbert $
+%% $Id: pst-func.tex 1184 2020-06-06 18:36:57Z herbert $
 %%
 %% This is file `pst-func.tex',
 %%
@@ -31,8 +31,8 @@
 % interface to the `xkeyval' package
 \pst@addfams{pst-func}
 %
-\def\fileversion{0.93}
-\def\filedate{2019/05/17}
+\def\fileversion{0.95}
+\def\filedate{2020/06/06}
 \message{`PST-func' v\fileversion, \filedate\space (hv)}
 %
 \pstheader{pst-func.pro}
@@ -268,6 +268,48 @@
   }%
 }\ignorespaces}
 %
+\define@key[psset]{pst-func}{n}[1]{\def\psk@func@n{#1 }}
+\psset[pst-func]{n=0}
+\def\psLaguerre{\@ifnextchar[{\psLaguerre@i}{\psLaguerre@i[]}}%% hv 20200111
+\def\psLaguerre@i[#1](#2,#3){{%%% n
+  \pst@killglue%
+  \psplot[#1]{#2}{#3}{%
+    /L_n 1 def
+    0 1 \psk@func@n {
+      /k_i ED
+      -1 k_i exp k_i factorial div 
+      \psk@func@n k_i MoverN mul
+      x k_i exp mul L_n add 
+      /L_n ED
+    } for
+    x \pst@number\psxunit mul L_n 
+    %dup == %\pst@number\psyunit div
+  }%
+}\ignorespaces}
+%
+\def\psLegendre{\@ifnextchar[{\psLegendre@i}{\psLegendre@i[]}}%% hv 20200115
+\def\psLegendre@i[#1](#2,#3){{%%% n
+  \pst@killglue%
+  \psplot[#1]{#2}{#3}{%
+    /P_n 0 def
+    \psk@func@n 0 eq { /P_1 1 def }{ \psk@func@n 1 eq { /P_1 x def }
+       { /P_0 1 def
+	 /P_1 x def  
+	 2 1 \psk@func@n {
+           /k_i ED
+           k_i dup add 1 sub x mul P_1 mul  % (2n-1)*x*P_1
+           k_i 1 sub P_0 mul sub  % − ( n−1 ) P_{n-2}(x)
+           k_i div
+           /P_0 P_1 def
+           /P_1 ED
+         } for 
+%n Pn ( x ) = ( 2n − 1 )  P_{n−1}(x) − ( n−1 ) P_{n-2}(x)       
+      } ifelse } ifelse
+    x \pst@number\psxunit mul P_1 
+    %dup == %\pst@number\psyunit div
+  }%
+}\ignorespaces}
+%
 \define@key[psset]{pst-func}{sigma}[0.5]{\def\psk@sigma{#1 }}
 \define@key[psset]{pst-func}{mue}[0]{\def\psk@mue{#1 }}
 \define@key[psset]{pst-func}{nue}[1]{\def\psk@nue{#1 }}