Math

Quiz: Chain Rule and Product Rules

Please Explain

Quiz: Integration and Linear Approximation

Please explain the pink area in the below area can be calculated as follows:

Programming

IF AND ELSE

Make Decision!

Else is "what to do" if all if statements return False

Different Priority

Not all decisions have the same priority!

Example: Buying Dinner

You will not check your walet before you are hungry!!! If hungry => If have money => Buy Dinner!

BTW, the graph I used are called "Flow Chart", which is common in programming Basically, diamonds mean decisions, rectangles means actions!

Python Syntax

var1 = 10
if var1 == 8:
    print("var1 is 8")
elif var1 == 9:
    print("var1 is 9 ")
elif var1 == 10:
    print("var1 is 10")
else:
    print("var1 is not 8,9,10")

var1 is 10

What if var1 = 11?

Relational operator

a<b: Is a less than b?
a>b: Is a larger than b?
a == b: Is a equal to b?
a>=b: Is a larger or equal to b?
a<=b: Is a less or equal to b?

a=1
b=2
c=2

a>b
a==c
b>=c
b>c

False
False
True
False

Comapre Strings

s1 = 'string1'
s2 = 'string2'


s1 == s2
s1[0:6]==s2[0:6]

False
True

While Loop

We have learned for loop when we need to do repeated task.
What if we don't know how many loops we need?

Wait? Then when should we end?

Use if/else statement

while(decision!):
    things you want to do in the loop!

Example: Print all integers square is less than 100

startNum=0
while(startNum^2<100):
    print(startNum)
    startNum+=1

Exercise 15 is quite difficult

Goal: Comapring 2 list with same length! example:

from haoSecretFun import compareList #of course I will not let you see my code!!!!
#Hint: you may need 2 for loops!


list1 = ["cat","dog","rabbit","pig"]
list2 = ["horse","cat","dog","pig"]
table(compareList(list1,list2))

Error in lines 1-1
Traceback (most recent call last):
  File "/cocalc/lib/python2.7/site-packages/smc_sagews/sage_server.py", line 1188, in execute
    flags=compile_flags) in namespace, locals
  File "", line 1, in <module>
ImportError: cannot import name compareList