2D graph modulus

[cliverlong]

Hello,

If I graph an equation with one modulus e.g.

y = (|x| − 1)

Autograph (3.3) shows the expected "V" shape

If I plot

y = |(|x| − 1)|

which Wolfram Alpha shows as a "W" - Autograph cannot handle this - nothing is plotted

Clive

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see some screen shots

[cliverlong]

Attached are two screen shots of how Wolfram Alpha plots the two equations - correctly in my opinion.

I have updated the original post a "few" times to correct errors

Clive
       

[Support]

Hello

This issue is caused by the ambiguity of the modulus symbol. Unlike brackets there is no distinct open and close modulus symbol so it is not always easy to determine nested expressions.

In order to resolve the abiguity you can use the alternative syntax for the nested modulus. e.g.

y = |(abs(x) − 1)|

Hope this helps.

Regards
Mark

[cliverlong]

(17-11-2011 10:39 AM)Support Wrote:  Hello

This issue is caused by the ambiguity of the modulus symbol. Unlike brackets there is no distinct open and close modulus symbol so it is not always easy to determine nested expressions.

In order to resolve the abiguity you can use the alternative syntax for the nested modulus. e.g.

y = |(abs(x) − 1)|

Hope this helps.

Regards
Mark

Thanks for the reply.

I thought that the answer would be difficulty in getting a program to parse a statement such as

| X|a||

However, in the example I gave I deliberately used brackets to overcome such a potential ambiguity, not just to a human reader but to Autograph. Also, Wolfram can handle the expression (with brackets) correctly.

But at least by using the abs() function I can enter the expression in a way that produces the expected results - in fact, I will check it now.

Clive

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The abs function works well. See attached example.

Thanks

clive