python syntax error output

Question

Please could you help me by fixing the error with my code. When I print last line I get a syntax error message:

import math


m_ = 900         # identifier for normal distribution mean   [mm]
s_d = 1          # identifier for normal distribution standard deviation [mm]

print "DISTRIBUTION OF A PLATE WIDTH:" " MEAN", "=",m_,"," "STD DEV", "=", s_d
print ""
print "Using functions from the math library ..."


# The probability density function(pdf) for a normal distribution with mean m_ and 
standard deviation s_d    
ftotal = 0
term = 0.0
count = 0
while abs(term) > 911:
    ftotal += term
    count += 1
    term = term * xx / float(count)


print "x"  "          " " f(x)" "           " " F(x)"
print "890" ""  (1 / ((s_d * (2 * math.pi) ** -0.5)) * math.exp((- (x - m_) ** 2) / (2 * (s_d) ** 2),   0.5 * (1 + math.erf((x - m_) / s_d * m.sqrt(2))

align the code in your while loop. It is not clear what your while loop has? — Hussain
– Hussain, Commented Feb 1, 2013 at 6:04
Also missing operator before 0.5 in (2 * (s_d) ** 2) 0.5 from last line. — Hussain
– Hussain, Commented Feb 1, 2013 at 6:06
sorry, these are two separated formulas, but I do not know how to separate them correctly — Samir Al-Bayati
– Samir Al-Bayati, Commented Feb 1, 2013 at 6:09
Define x first. by xx do you mean x*x? In last line, at the end you have written m.sqrt(2) I think you mean math.sqrt(2). Also put , after "890". And put matching braces in the last line. — Hussain
– Hussain, Commented Feb 1, 2013 at 6:20

Hussain · Accepted Answer · 2013-02-01 06:28:44Z

3

Define x before the while loop. From the last two lines where you have denoted x by 890 so I am guessing x = 890.

x = 890
#your while loop goes here

print "x"  "          " " f(x)" "           " " F(x)"
print "890" ,  (1 / ((s_d * (2 * math.pi) ** -0.5))) * math.exp((- (x - m_) ** 2) / (2 * (s_d) ** 2))  , 0.5 * (1 + math.erf((x - m_) / s_d * math.sqrt(2)))

I can't remember the exact formula but if the above expressions are correctly put, you won't get a syntax error.

answered Feb 1, 2013 at 6:28

Hussain

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Hussain Over a year ago

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