Term
| Complex Data type creation |
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Definition
| Complex number: "a = b + cj" |
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Term
| How to cut up a string or array |
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Definition
String:
"s = my_string[0:6]" is first 6 letters of my_string.
Array:
"A = my_array[0:6]" is first 6 items of the array.
2d Array:
Regular - "name = lab_groups[1][2]" is row 2 column 3.
numpy - "name = lab_groups[1,2]" |
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Term
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Definition
"float(a)"
"int(a)"
"str(a)" |
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Term
| What libraries are useful? |
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Definition
math, random, numpy
"help(LibraryName)" lists out all the functions imported. |
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Term
| How do you import just a function from a library? |
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Definition
| "from math import sqrt as Some_Function" |
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Term
| How do you format a string? |
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Definition
| "print(f"My name is {name} and I'm {age} years old.")" |
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Term
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Definition
lab_group0 = [8,9]
lab_group1 = [1,2,3]
nested_lab_groups = [lab_group0, lab_group1]
nested_lab_groups == [[8,9],[1,2,3]]
"list = [0]*5" makes a list of 5 zeros.
"list.append()" |
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Term
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Definition
A list that cannot be changed after creation.
"t = ("str", 0)"
By doing "t = ("str",)" the len(t) = 1, instead of three (length of "str").
You can make a list of tuples. |
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Term
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Definition
"rooms = {"Joe": None, "Bob": 32, "John": 31}"
"Bob_room = rooms["Bob"]"
Therefore, Bob_room == 32
""Jess" in rooms" is false
""Joe" in rooms" is true |
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Term
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Definition
"x = np.zeros(5)"
"y = np.random.rand(6)"
"z = np.array([2,3,4])"
"a = np.arrange(6)":
Equally spaced values, [0 1 2 3 4 5] for this one.
"b = np.linspace(0,100,6)":
(start val, end val, number of items), [ 0. 20. 40. 60. 80. 100.].
Start/End val are inclusive.
"c = 10.0*a" scales all values in x by 10. |
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Term
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Definition
| %time norm = f(x) calculates the time to complete function f upon x. |
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Term
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Definition
"A = np.array([[2, 3, 9.1], [3, 1.3, 1]])"
"A.shape" is (2,3) <-- tuple |
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Term
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Definition
"y = A.dot(x)" is 'y = Ax'
"Ainv = np.linalg.inv(A)"
"Adet = np.linalg.det(A)" are both useful. |
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Term
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Definition
"import matplotlib
import matplotlib.pyplot as plt"
"plt.plot(x, f)" plots two arrays against each other.
"plt.loglog()" creates a log graph;.
"plt.xlabel('$x$')
plt.ylabel('$f$')
plt.title("Simple plot of $x$ vs $f$")"
"plt.xlim(x[0], x[-1])" limits the graph size.
"plt.show()" displays the graph. |
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Term
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Definition
"raise ErrorType("Error message")"
"Try:
Except:" |
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Term
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Definition
Binary search: Find the midpoint and work from there.
Bubble sort:Iterate across the array and if any neighbours are in the wrong place they are swapped.
Quick sort: a pivot point is chose at the mid point of remaining arrays and larger/smaller values are seperated. |
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Definition
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