[Python] 파이썬 학습일지 08

matplotlib

< matplotlib 그래프 기본 형태 >

plt.figure(figsize=(10, 6))
plt.plot(x, y)
plt.show

> plt.figure(figsize=(10, 6))
plt.plot([0, 1, 2, 3, 4, 5, 6, 7, 8, 9], [1, 1, 2, 3, 4, 2, 3, 5, -1, 3])

> plt.show()

1. 삼각함수 그래프

• np.arange(a, b, s): a부터 b까지 s의 간격
• np.sin(value)
  
  

> import numpy as np 

> t = np.arange(0, 12, 0.01)
> y = np.sin(t)

> plt.figure(figsize=(10, 6))
> plt.plot(t, np.sin(t))
> plt.plot(t, np.cos(t))
> plt.show()

여기서 격자 무늬 추가 + 그래프 제목 추가 + x축,y축 제목 추가 + 범례 표시

> def drawGraph():

    plt.figure(figsize=(10, 6))
    plt.plot(t, np.sin(t), label="sin")
    plt.plot(t, np.cos(t), label="cos")
    plt.grid(True)
    plt.legend(loc=2) # 범례 
    plt.title("Example of sinewave")
    plt.xlabel("time")
    plt.ylabel("Amplitude") # 진폭 
    plt.show()
    
    
> drawGraph()

2. 그래프 옵션 추가

> t = np.arange(0, 5, 0.5)
> t

> plt.figure(figsize=(10, 6))
> plt.plot(t, t, "r--") # red ---- 
> plt.plot(t, t ** 2, "bs") # blue square
> plt.plot(t, t ** 3, "g>") # grean '>'
> plt.show()

# t = [0, 1, 2, 3, 4, 5, 6]


> t = list(range(0, 7))
> y = [1, 4, 5, 8, 9, 5, 3]


> def drawGraph():

    plt.figure(figsize=(10, 6))
    plt.plot(
        t,
        y,
        color="red", 
        linestyle="--", 
        marker="o", 
        markerfacecolor="blue",
        markersize=10, 
    )

    plt.xlim([-0.5, 6.5]) 
    plt.ylim([0.5, 9.5])
    plt.show() 
    
> drawGraph()

3. scatter plot
   
   

> t = np.array(range(0, 10))
> y = np.array([9, 8, 7, 9, 8, 3, 2, 4, 3, 4])

> def drawGraph():

    plt.figure(figsize=(10, 6))
    plt.scatter(t, y)
    plt.show()
    
> drawGraph()

> colormap = t 

> def drawGraph():

    plt.figure(figsize=(10, 6))
    plt.scatter(t, y, s=150, c=colormap, marker=">")
    plt.colorbar()
    plt.show()
    
> drawGraph()

4. bar plot
   
   

> data_result.head()

> data_result["인구수"].plot(kind="bar", figsize=(10,10))

> data_result["인구수"].plot(kind="barh", figsize=(10,10))