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Student Support Forum: 'ReplaceAll question.' topicStudent Support Forum > General > Archives > "ReplaceAll question."

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Daniele Lupo
10/14/07 09:51am

Hi...

I've not a problem, but a question...

I've this list of equations

sis = {
0.125 == 2.5*(b + c + d)/(a + b + c + d),
0.079 ==
2.5*(b + c + ((d*35)/(d + 35)))/(a + b + c + ((d*35)/(d + 35))),
0.069 ==
2.5*(b + ((c*35)/(c + 35)) + ((d*35)/(d + 35)))/(a +
b + ((c*35)/(c + 35)) + ((d*35)/(d + 35))),
0.055 ==
2.5*(((b*35)/(b + 35)) + (c*35)/(c +
35) + ((d*35)/(d + 35)))/(a + ((b*35)/(b +
35)) + (c*35)/(c + 35) + ((d*35)/(d + 35)))
};

I want to change 35 with 85, but ReplaceAll does not work

sim /. 35 -> 85

Instead, it works if I use ReplaceRepeated:

sim //. 35 -> 85

Why this difference? Theretically, ReplaceAll must work, I think. Why /. does not work in this case?

Daniele

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Subject (listing for 'ReplaceAll question.')
Author Date Posted
ReplaceAll question. Daniele Lupo 10/14/07 09:51am
Re: ReplaceAll question. yehuda ben-s... 10/16/07 02:37am
Re: ReplaceAll question. Peter Pein 10/16/07 09:05am
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