vv

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8 years, 267 days

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These are questions asked by vv

restart;
unames();  # first call ok
unames();  # second call


Error, invalid input: Typeset:-Kernel expects an equation for keyword parameter numericformatting

Error, unexpected result from Typesetting

 

RootOf has the option index=real[i]  for the i-th real root:

evalf([seq(RootOf(x*(x^2-1)*(x^2-4)+1/100, x, index=real[i]), i=1..5)]);
     [-2.000416306, -0.9983310082, -0.002500019532, 1.001664362, 1.999582971]

This option does not seem to be documented. Why? Or, is it?

 


 

alias in rtables does not work when typesetting=extended (default in Maple 2017)

restart;

alias(alpha=RootOf(z^3+z+1,z));

alpha

(1)

L:=simplify([seq(alpha^k,k=0..5)]);

[1, alpha, alpha^2, -alpha-1, -alpha*(alpha+1), -alpha^2+alpha+1]

(2)

V:=convert(L,Vector);

_rtable[18446744074335181870]

(3)

interface(typesetting=standard);

extended

(4)

V;

7275930162710271107275012117273962706

(5)

 

unames()   produces an error  in extended typsetting mode (the default in Maple 2017)  after any output.

#interface(typesetting=standard);

restart;

interface(typesetting=extended);

extended

(1)

unames();

Error, invalid input: Typeset:-Kernel expects an equation for keyword parameter numericformatting

 

` `

 

Error, unexpected result from Typesetting

 

 

According to the help page:
interface(displayprecision=n)
sets the number of decimal places to be displayed to n.
But this is true only if interface(typesetting=extended).
For interface(typesetting=standard),  n represents the number of decimal places after the decimal point.
Is there any reason for this decision?

restart;
x:=123.456789012345:
interface(displayprecision=4):
interface(typesetting=standard): x;

                        123.4568
interface(typesetting=extended): x;
                        123.5

 

 

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