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patterns question

Posted 10 years ago

Hello everyone, I'm newbie. Why in {1, x^1, x^2, x^3} /. x^n_ -> r[n] out {1, x, r[2], r[3]} ? I expected {1, r[1], r[2], r[3]}

Thanks in advance.

POSTED BY: rionilo

Hi,

That is since x^1 is automatically evaluated to x. Compare:

x^1 // FullForm
x^n // FullForm

Use HoldForm[] to get what you expect:

HoldForm[{1, x^1, x^2, x^3}] /. x^n_ -> r[n]

I.M.

POSTED BY: Ivan Morozov
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