HP 40g hp 39g+ (39g & 40g)_mastering the hp 39g+_English_E_F2224-90010.pdf - Page 258
The | function, B+C/D|B=6, C=-2, D=8, A=9.8, T=6, 4 meters
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The | function written as: expression | (var1=value,var2=value,...) This is called the 'where' function. The reason for this is that it is used to evaluate formulas, of the type when one would say "Evaluate ....., where a = 5, b = 4 etc". The formula must be in the form of an expression rather than an equation. You should enter the equation first, then the 'where' symbol and then the values of all the variables in the expression. Any not supplied will be evaluated using the value currently stored in that memory. This is again a function which is of more use to programmers since this is probably more flexibly handled in the Solve aplet. Eg. 1 Evaluate a = b + c where b = 6, c = -2 and d = 8 d Use: Answer: (B+C)/D|(B=6,C=-2,D=8) 0.5 Eg. 2 Using the formula d = 1 at2 , find the distance d which an object 2 would fall under Earth's gravity of 9.8 m/s2 in a time of 6 seconds. Use: Answer: .5AT2|(A=9.8,T=6) 176.4 meters See also: ISOLATE 258