MATLAB: Where can I get information on the symbols ‘_alpha’ or ‘_Z ‘ in some of the expressions I get from the MAPLE function in the Extended Symbolic Toolbox 3.2.2 (R2007b)

_alpha_zextendedmhelpsymbolicSymbolic Math Toolboxtoolbox

The output from a MAPLE command might contain symbols that are not in MATLAB documentation such as' _alpha' or '_Z'. I am trying to find some information about them.

Best Answer

Symbols such as '_alpha' and '_Z' are intermediate expressions that appear in the output from Maple called in the MAPLE command. For instance, Maple uses variables of the form _Z to represent arbitrary integers.

These intermediate expressions can be evaluated even further by using the following command:

maple('_EnvAllSolutions:=true')

You will need the Extended Symbolic Math Toolbox to execute the above command. For more information on these variables, you can use Maple Help by using the command MHELP. The Student Version does not include the Extended Symbolic Math Toolbox.

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MATLAB: How to create a symbolic integer in the Symbolic Math Toolbox

If you are using the MuPad symbolic engine from Symbolic Toolbox (R2008b) or higher, you can use the ASSUME function from MuPad as follows:

syms x
evalin(symengine,'assume(x,Type::Integer)')

To remove assumptions from the variable x, you can use the following command:

syms x clear

If you are using Symbolic Toolbox (R2008a) or before, you will also need the Extended Symbolic Toolbox to do this. The Maple function ASSUME allows you to add assumptions to a symbolic variable. The following example demostrates the creation of a symbolic integer variable:

syms x
maple('assume(x,integer)');

MATLAB: How to approximate a polynomial using the Symbolic Toolbox

To approximate a polynomial, use the POWMOD function from the Extended Symbolic Toolbox. Here is an example which does this:

syms x y
z=expand((x+y)^10)
maple('readlib(powmod)')
maple('powmod',z,1,x^6,x)

Best Answer

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