Numpy學(xué)習(xí)筆記（三）

    tian=np.linspace(-10,10,20)    print(tian)    tian=np.abs(tian)    print(tian)

    tian=np.linspace(1,3,3)    tian=tian*tian    print(tian)    print(np.sqrt(tian))

    tian=np.square(tian)    print(tian)

    tian=np.arange(1,10,1)    print(tian)    print(np.log10(tian))

    tian=np.rint(tian)    print(tian)

    tian=np.arange(1,3,1)    tian=np.exp(tian)    print(tian)

    tian=np.linspace(-1,5,6)    print(np.sign(tian))

    tian=np.linspace(-1,5,6)    zhang=np.linspace(2,6,6)    print(np.sign(tian))    print(np.maximum(tian,zhang))

tian=np.arange(1,100,1)#參數(shù)這里的tianjingle.txt是文件名稱#fmt元素的格式，%d表示整數(shù)，%.2f表示浮點數(shù)保留兩位小數(shù)np.savetxt('tianjingle.txt',tian,fmt="%d",delimiter=",")

    tian=np.loadtxt("tianjingle.txt",dtype=np.int64,delimiter=",",unpack=False)    print(tian)

    #平均值    print(np.mean(tian))    #加權(quán)平均值    print(np.average(tian))    #標(biāo)準差    print(np.std(tian))    #計算方差    print(np.var(tian))    #最大值與最小值的差    print(np.ptp(tian))    #中位數(shù)    print(np.median(tian))

print(np.gradient(tian))

    file="C:\\Users\\Administrator\\Desktop\\新建文件夾\\IMG_20201002_161629.jpg"    tian=np.array(Image.open(file).convert('L'))    tian=tian.astype(np.int8)    image=Image.fromarray(tian)    image.save("tianj.png")    im=Image.open("tianj.png")    im.show()