Hp 50g Graphing Calculator Manual do Utilizador descarregar pdf (Página 351)

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101

Page 11-24

Press ` to return to the numerical solver environment. To check that the

solution is correct, try the following:

• Press ——, to highlight the A: field.

• Press L @CALC@ `, to copy matrix A onto the stack.

• Press @@@OK@@@ to return to the numerical solver environment.

• Press ˜ ˜@CALC@ `, to copy solution vector X onto the stack.

• Press @@@OK@@@ to return to the numerical solver environment.

• Press ` to return to the stack.

In ALG mode, the stack will now look like this:

Let’s store the latest result in a variable X, and the matrix into variable A, as

follows:

Press K~x` to store the solution vector into variable X

Press ƒ ƒ ƒ to clear three levels of the stack

Press K~a` to store the matrix into variable A

Now, let’s verify the solution by using: @@@A@@@ * @@@X@@@ `, which results in the

vector [8.6917… -3.4109… -1.1301…], which is not equal to [15 5 22], the

original vector b. The “solution” is simply the point that is closest to the three

lines represented by the three equations in the system, and not an exact

solution.

Least-square solution (function LSQ)

The LSQ function returns the minimum-norm least-square solution of a linear

system Ax = b, according to the following criteria:

1 2 ... 346 347 348 349 350 351 352 353 354 355 356 ... 886 887

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Hp 50g Graphing Calculator Manual do Utilizador Página 351

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