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Task/Random-numbers/ERRE/random-numbers.erre

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+PROGRAM DISTRIBUTION
+
+!
+! for rosettacode.org
+!
+
+! formulas taken from TI-59 Master Library manual
+
+CONST NUM_ITEM=1000
+
+!VAR SUMX#,SUMX2#,R1#,R2#,Z#,I%
+
+DIM A#[1000]
+
+BEGIN
+! seeds random number generator with system time
+   RANDOMIZE(TIMER)
+
+   PRINT(CHR$(12);)  !CLS
+   SUMX#=0  SUMX2#=0
+
+   FOR I%=1 TO NUM_ITEM DO
+      R1#=RND(1)  R2#=RND(1)
+      Z#=SQR(-2*LOG(R1#))*COS(2*π*R2#)
+      A#[I%]=Z#/2+1   ! I want a normal distribution with
+                      !      mean=1 and std.dev=0.5
+      SUMX#+=A#[I%]  SUMX2#+=A#[I%]*A#[I%]
+   END FOR
+
+   Z#=SUMX#/NUM_ITEM
+
+   PRINT("Average is";Z#)
+   PRINT("Standard dev. is";SQR(SUMX2#/NUM_ITEM-Z#*Z#))
+
+END PROGRAM