Cumulative standard deviation: Difference between revisions
Add FOCAL
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<standard-deviator> [ [ add-value ] curry each ] keep
current-std number>string print ;</lang>
=={{header|FOCAL}}==
<lang FOCAL>01.01 C-- TEST SET
01.10 S T(1)=2;S T(2)=4;S T(3)=4;S T(4)=4
01.20 S T(5)=5;S T(6)=5;S T(7)=7;S T(8)=9
01.30 D 2.1
01.35 T %6.40
01.40 F I=1,8;S A=T(I);D 2.2;T "VAL",A;D 2.3;T " SD",A,!
01.50 Q
02.01 C-- RUNNING STDDEV
02.02 C-- 2.1: INITIALIZE
02.03 C-- 2.2: INSERT VALUE A
02.04 C-- 2.3: A = CURRENT STDDEV
02.10 S XN=0;S XS=0;S XQ=0
02.20 S XN=XN+1;S XS=XS+A;S XQ=XQ+A*A
02.30 S A=FSQT(XQ/XN - (XS/XN)^2)</lang>
{{out}}
<pre>VAL= 2.00000 SD= 0.00000
VAL= 4.00000 SD= 1.00000
VAL= 4.00000 SD= 0.94281
VAL= 4.00000 SD= 0.86603
VAL= 5.00000 SD= 0.97980
VAL= 5.00000 SD= 1.00000
VAL= 7.00000 SD= 1.39971
VAL= 9.00000 SD= 2.00000</pre>
=={{header|Forth}}==
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