## basti!

Hey,

can somebody help me. I have to do a programm from school. I a complete newbie in python.
Can somebody tell me why my programm doesn't work and what i can do. thanks

here it is:

``````import matplotlib
import numpy
import pylab

lam = pylab.linspace(0.1,100,1000)*10**-6

pylab.xlabel('Wellenlaenge (mM)')
pylab.ylabel('Temperatur (T)')
pylab.title('Mac Plank')

c1  = 0.374*10**-15
c2  = 1.439*10**-2

p= lamda x,t : (c1/(x**5))*(1/(2.7183**(c2/x*t))-1)

pylab.plot (lam*1e6,p(lam,300))

for t in (300,400,600,800,1000): pylab.plot(lam*1e6, p(lam,t)``````

## pyTony 888

Hey,

``````import matplotlib
import numpy
import pylab

lam = pylab.linspace(0.1,100,1000)*10**-6

pylab.xlabel('Wellenlaenge (mM)')
pylab.ylabel('Temperatur (T)')
pylab.title('Mac Plank')

c1  = 0.374*10**-15
c2  = 1.439*10**-2

p= lamda x,t : (c1/(x**5))*(1/(2.7183**(c2/x*t))-1)

pylab.plot (lam*1e6,p(lam,300))

for t in (300,400,600,800,1000): pylab.plot(lam*1e6, p(lam,t)
``````

end quote.

You have unterminated parenthesis in the last line at least. I am not using pylab myself (yet).

Do you see how much nicer the code looks if you first click the (CODE) before pasting your code?

Tony

## woooee 814

Can somebody tell me why my programm doesn't work and what i can do

Not without more info. Please include the traceback message at a minimum, with a simple explanation of what isn't working.

## basti!

It now looks like this.My Problem is that it does't work and i don't know why.
At the end, a window should open and show me the graph.
the the window is empty with no graph.but why.what do i have to change that it works?

``````import numpy as np
import pylab as plt
from math import exp, e
from matplotlib.pyplot import legend, xlim, ylim, show

lam = np.linspace (0.1,100,1000)*10**-6
c1=0.374e-15
c2=1.439e-2

def lamda(x):

return ((c1/(x**5))*(1/(exp(c2/x*300))-1))

plt.plot(lam,lamda(lam))

legend()

xlim(0, 10)
ylim(0, 14000)

plt.xlabel('Wellenlaenge(muekrometer)')
plt.ylabel('Spektrale Energieflussdichte(W/m^2muekrometer)')
plt.title('Planck')

show()``````

## woooee 814

A line is more than a single point if you are trying to code a line. I don't know. You didn't say. But if you want a bar graph for example then you have to code for a bar, see this example from the matplotlib docs http://matplotlib.sourceforge.net/examples/pylab_examples/barchart_demo.html Take a look at Ene's example here as well http://www.daniweb.com/code/snippet216915.html I'm outta here. Your descriptions are too vague and I'm sorry, but don't have the time to try and intuit what it is you are trying to do.