HP Prime Graphing NW280AAABA manual Rewrite

Differential Equation

ODE Solve

Linear System

Returns the solution to a differential equation.

deSolve(Eq,[TimeVar],Var)

Example:

desolve(y''+y=0,y) returns G_0*cos(x)+G_1*sin(x)

Ordinary Differential Equation solver. Solves an ordinary differential equation given by Expr, with variables declared in VectrVar and initial conditions for those variables declared in VectrInit. For example, odesolve(f(t,y),[t,y],[t0,y0],t1) returns the approximate solution of y'=f(t,y) for the variables t and y with initial conditions t=t0 and y=y0.

odesolve(Expr,VectVar,VectInitCond,Final

Val,[tstep=Val,curve])

Example:

odesolve(sin(t*y),[t,y],[0,1],2) returns [1.82241255674]

Given a vector of linear equations and a corresponding vector of variables, returns the solution to the system of linear equations.

linsolve([LinEq1, LinEq2,…], [Var1, Var2,…])

Example:

linsolve([x+y+z=1,x-y=2,2*x-z=3],[x,y,z]) returns [3/2,-1/2,0]

Rewrite

lncollect Rewrites an expression with the logarithms collected. Applies ln(a)+n*ln(b) = ln(a*b^n) for an integer n.

lncollect(Expr)

Example:

lncollect(ln(x)+2*ln(y)) returns ln(x*y^2)

powexpand Rewrites an expression containing a power that is a sum or product as a product of powers. Applies a^(b+c)=(a^b)*(a^c).

powexpand(Expr)

Example:

powexpand(2^(x+y)) yields (2^x)*(2^y)

332 Functions and commands