wolfram-1

發表於 更新於 Disqus：
文章字數： 1.9k 所需閱讀時間 ≈ 2 分鐘

WolframAlpha prcatice

What is the capital of france?

integrate E^x from 0 to 10

run wolframcloud

  • new : My file -> New –> change file name
  • run : Shift + Enter

simple practice(shift + Enter)

1
2
print["hello world!"]	
4+5

command

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
# shift + Enter :  run
5+ 8

# ; 抑制輸出
5+ 8;
# 不需順序
a = 1;
a + 2
a = 8; # then back run a+2 --> 

# 可選擇執行
# mouse-left shift move mouse enter - run all select
# run all
# Evaluation ->Evaluate all cells

# reset (a blue mean undefine)
# Evaluation -> Quit kernel
# a + 2 --> 2 + a mean a not define
# can delete all output
# Evaluation -> delete al loutput

#split cell and merge cell - wolfram cloud not support
1
2
3
4
5
6
7
8
# cell styles
# Alt+9 : Input
# Alt+7 : Text 
# Alt+1 : Title
# Alt+4 : section
# Alt+5 : subsection
# Alt+6 : Subsubsection
# Alt+0 : support all select - wolfram cloud not support
1
2
3
# colors and Stylesheet
# format : change size, color, background
# Stylesheet - wolfram cloud not support

basic arithmetic

1
2
3
4
5
6
7
8
9
10
11
12
1 + 3 ---> 4
1/8 --> 1/8
N[1/8] --> 0.125
# last time count
N[%] --> 0.125 

# variable
b = 2 
2 * b --> 4
N[Exp[b]] --> 7.3896 # e 的 2次方
# blue mean undefine

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
# "FullForm"完整型式 and "Head" argument
c = 1
	1
FullForm[2-d]
	Plus[2,Times[-1,d]] # -1 * d
Head[2-d]
	Plus
Head[2*c]
	Integer
Head[2*d]
	Times
c
	1
Head[2*c]
	Integer
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
# automatic data types
Head[2*c]
	Intege
Head[2]
	Intege
Head[2.0]
	Real
Head[2+1I]
	Complex  # 複數
Head[2.0+0*I]
	Real
Head[2.0+0.0*I]
	Complex  # 複數
Head["Hello .."]
	String 
Head[var]
	Symbol
Head[var test]
	Times 
Head[var*test]
	Times
1
2
3
4
5
6
7
8
9
10
11
12
13
14
# Conversion
Head[2.0]
	Real
Head[ToString[2.0]]
	String
ToString[2.0]
	2.
2.0
	2.
answer = "The answer is " <> ToString[2.0];
answer
	Theansweris2.
Print["The answer is ", 2.0]
	Print["The answer is ", 2.0]
1
2
3
4
5
6
# syntax seek
# - wolfram cloud only output value, cannot see function
= Calculate the sum of all numbers between 1 and 10
	55
# https://reference.wolframcloud.com/language/ - search
# search plus, sum

Ref