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HP Prime and TI-84 Plus CE: Percent Change on Paired Data

HP Prime and TI-84 Plus CE:  Percent Change on Paired Data

Introduction

Given a two column matrix, the programs here calculate the percent difference on each row.  The first column is the old value while the second column is the new value.

HP Prime Program %CHGPAIRED

EXPORT %CHGPAIRED(m0)
BEGIN
// Δ% on a 2 column matrix
// 2019-03-31 EWS
LOCAL k,s:=SIZE(m0);
LOCAL n:=s(1);
LOCAL m1:=MAKEMAT(0,n,1);
FOR k FROM 1 TO n DO
m1(k,1):=%CHANGE(m0(k,1),m0(k,2));
END;
RETURN m1;
END;

TI-84 Plus Program CHGPAIR

“2019-03-31 EWS”
Disp “PCHG PAIRED DATA”
Input [J]
dim([J])→L₆
L₆(1)→N
{N,1}→dim([I])
For(K,1,N)
([J](K,2)-[J](K,1))/[J](K,1)*100→[I](K,1)
End
Pause [I]

Example

M =
[[ 1, 6 ], [ 4, 2 ], [ 3, 7 ], [ 6, 5 ], [ 4, 11 ]]

Result:
[[ 500 ], [ -50 ], [ 133.3333333 ], [ -16.6666667 ]]

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Source:  “Probability and Statistics:  Step by Step Solutions for Your HP-28S or HP-28S Calculator”  Hewlett Packard.  November 1987.

Eddie

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