# RE: About a formula

From: Sawala, Till <till.sawala_at_imperial.ac.uk>
Date: Thu, 12 Oct 2006 11:27:51 +0100

Hi,

It's not a root problem, your two equations are not identical:

In the first line, you have (Sin(x)/1.414)^2 , in the second, you have
(sin(x)/(1.414)^2).

In general, try to cut down the number of bracktest to make the expression less difficult to read.

Till

-----Original Message-----
From: owner-roottalk_at_pcroot.cern.ch
[mailto:owner-roottalk_at_pcroot.cern.ch] On Behalf Of Muhammad Asghar Sent: 12 October 2006 09:41
To: roottalk_at_pcroot.cern.ch
Subject: [ROOT] About a formula

Hi Rene

I am trying to plot a formula which is

S = 3/2 * [ 0.703 * (Sin(x)/1.414)^2 + 0.297 * ((1-Cos(x))/2)^2 +
((1+Cos(x))/2)^2 ].

I have tried to use the

root[]TF1
f1("polarization","(3/2)*(0.703*(sin(x)/(1.414)^2))+(3/2)*(0.297*((((1-c os(x))/2)^2)))+(3/2)*(((1+cos(x))/2)^2)",-1,1);

root[] f1->Draw(); Received on Thu Oct 12 2006 - 12:28:13 MEST

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