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I wrote a program in Python that calculates a random walk for an array given certain parameters.

I presume the "random" function is working, since I get the output " (I am using iPython). However, I cannot plot the function on a graph, because the float() argument must be a string or number, not a function. Nevertheless, given the recursive nature of the variables in question, it needs to be defined as a function for the program to run.

How can I graph this?

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How about this?

randomnumbers = np.random.normal((mu*(price/10)), (v*(price/10)), days) #This variable generates a series of random numbers based on the normal distribution and in accordance with the return and volatility specified.
randomwalk    = [simAssetPrice[i-1] + randomnumbers[i] + k for i in range(1,days)]

plt.plot(randomwalk)
plt.ylabel('Price')
plt.show()

I had to use one more random number then you specified.

In place of your randomwalk() function, I've used a list comprehension.

Using the same names for variables as for functions is bound to mess things up. Also, since you wrote:

randomwalk
plt.plot(randomwalk)

You were referring to a "pointer" to the function. You need to write randomwalk(simAssetPrice, randomnumbers) in order to call the function.

You may want to review how functions work in Python.

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Thanks Richard. It worked in graphing the plot. However, the reason I defined it as a function was because it wasn't generating a random walk. In other words, the array was scattered around the straight-line return in a zig-zag fashion, because the calculation is not iterating from the previous variable (for price), and that still seems to be an issue. Could you assist in any way?
I'm afraid I don't follow. What are the axes you are expecting on your graph?
Essentially, I am looking to generate a random walk for the stock price (with the x axis being number of days and y being the price). However, instead of a random walk, what is happening is that the stock price is simply oscillating up and down in a zig-zag fashion (imgur.com/nGaAcq2). This is because the array generated is not iteratively calculating the next day's price because we are simply adding randomness to the entire array.
Never mind, I solved it by redefining the price variable to include the random element right off the bat, thus saving the need for a recursive function.

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