大家好:

我在计算由角速度资料(b)与角位移资料(c)所成组的相位图(phase plot)时用了反函数atan2，举例式子是a=atan2(b,c)*180/pi，跑出来的数据如下:

a=

-14.5327

-9.7880

-9.7552

-9.8496

-12.3214

-14.3848

-18.1224

-23.1806

-28.4860

-34.6558

-40.8052

-45.8199

-49.8615

-53.5313

-56.3068

-59.3246

-62.9291

-66.2847

-69.4982

-73.5623

-77.1360

-80.2927

-84.4998

-88.7608

-92.6181

-97.0836

-101.8136

-106.6225

-111.6560

-117.3426

-121.8821

-126.4374

-130.8890

-135.4877

-139.3230

-143.6598

-147.5823

-151.1743

-152.6577

-153.1012

-151.8536

-151.1238

-149.7453

-151.9676

-154.2430

-157.9746

-161.4020

-165.2734

-164.3997

-164.2262

-164.3886

-164.5684

-164.7601

-166.7409

-168.6037

-170.0764

-172.0060

-174.8464

-178.8353

176.8210

171.6738

166.4896

162.6849

160.3933

157.9115

156.4301

154.2258

149.4389

142.2703

135.3745

128.3850

123.0225

118.7116

115.1354

112.4225

109.7294

106.0957

102.4160

98.6703

94.4670

89.9373

85.2112

79.8130

74.4712

70.5233

67.6185

67.8576

67.2684

65.7067

61.6403

57.9027

49.7366

42.2532

35.2150

30.3655

25.5905

24.5535

22.6497

20.3742

16.4996

11.0589

5.7224

0.3822

-2.3164

-3.0631

-1.7874

-0.1070

1.2855

-1.1074

-1.4933

-4.0869

0.0923

之後有使用unwrap矫正，式子为d=unwrap(a*pi/180)*180/pi，但是跑出来的图如下:

请问有哪边出错了吗?谢谢。