MathAction #188 the do instruction doesn't display any result

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  - #188 the do instruction doesn't display any result <-- You are here.

fricas

(1) -> do 
  1
  2

Type: PositiveInteger?

The result is a PositiveInteger?. I don't read the value 2

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That is a feature?? (perhaps useful just for its side effects; and do seems not documented -- it is equivalent to adding semicolons to each line of the pile, without the type info outputted on each line except the last). You need to explicitly ask to display a value.

fricas

do
  1
  2

Type: PositiveInteger?

fricas

$\label{eq1}2$

(1)

Type: PositiveInteger?

fricas

do i for i in 1..3

Type: Tuple(PositiveInteger?)

fricas

$\label{eq2}\left[ 1, \: 2, \: 3 \right]$

(2)

Type: Tuple(PositiveInteger?)

fricas

x:=do [i for i in 1..3]

Type: List(PositiveInteger?)

fricas

$\label{eq3}\left[ 1, \: 2, \: 3 \right]$

(3)

Type: List(PositiveInteger?)

fricas

1;

Type: PositiveInteger?

fricas

2;

Type: PositiveInteger?

fricas

$\label{eq4}2$

(4)

Type: PositiveInteger?

... --unknown, Fri, 01 Jul 2005 06:12:48 -0500 reply

I need the do command for tests with => in interpret input.

fricas

1=2 => 3

Type: Void

fricas

2=2 => 4

$\label{eq5}4$

(5)

Type: PositiveInteger?

Isn't right.

fricas

do 
  1=2 => 3
  2=2 => 4

Type: PositiveInteger?

is better. I don't understand why the do command runs with a semicolon ; at the end. If I don't want any display I add a semicolon, if not I get the result.

do expressions in Aldor --unknown, Fri, 01 Jul 2005 08:02:35 -0500 reply

Quoted from the Aldor User Guide at http://www.aldor.org/docs/HTML/chap5.html#7

The do expression evaluates E and discards the computed value, so that the do expression returns no value.

do E

This is intended behaviour --kratt6, Fri, 19 Aug 2005 03:18:05 -0500 reply

Status: open => rejected

Subject: (replying) Be Bold !!

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