How do I make a code that will count the number of times the sign changes succesively through an array?

12 次查看(过去 30 天)
I need to make a code that reads this array and counts the number of times there is a sign change. This is the array DAX = 0.0022 0.0085 -0.0178 -0.0117 -0.0199 -0.0135 -0.0177 -0.0474 -0.0196 0.0068 -0.0115 -0.0178 0.0050 -0.0098 -0.0096 0.0348 -0.0008 0.0442 -0.0203 -0.0205 -0.0156 0.0240 0.0266 0.0039 0.0293 0.0048 -0.0352 0.0054 -0.0274 0.0013 -0.0456 0 -0.0028 0.0024 -0.0487 -0.0197 -0.0104 -0.0128 0.0248 -0.0254 -0.0354 -0.0052 0.0528 -0.0515 -0.0079 0.0070 0.0515 0.0070 0.0107 -0.0007 0.0227 -0.0141 0.0021 0.0117 0.0062 0.0261 0.0026 0.0085 0.0085 -0.0132 -0.0523 0.0237 0.0113 0.0590 0.0007 -0.0081 -0.0063 0.0082 0.0301 0 0 0.0146 -0.0016 0.0130 0.0145 -0.0416 0.0034 0.0204 0.0172 0.0042 -0.0186 0.0209 0.0137 0.0275 -0.0101 0.0057 -0.0158 0.0226 -0.0096 -0.0026 -0.0264 0.0023 -0.0002 0.0239 0.0378 -0.0278 0.0037 -0.0001 0.0136 0.0030 -0.0137 0.0016 0.0400 0.0003 -0.0176 0.0020 0.0024 -0.0143 -0.0014 0.0106 0.0110 -0.0075 -0.0360 0.0002 -0.0187 0.0078 0.0004 -0.0306 0.0029 0.0270 -0.0074 -0.0050 0.0225 -0.0158 0.0199 -0.0389 -0.0022 -0.0120 -0.0116 -0.0056 0.0125 -0.0117 0.0314 0.0125 0.0302 0.0058 0.0043 0.0103 0.0126 0.0054 0.0243 -0.0034 0.0042 -0.0147 0.0183 0.0170 -0.0053 0.0176 -0.0018 -0.0119 0.0032 0.0164 -0.0075 -0.0247 0.0121 0.0095 -0.0172 -0.0205 0.0094 -0.0036 0.0150 0.0282 0.0104 0.0067 -0.0063 -0.0094 0.0086 -0.0108 -0.0242 -0.0014 -0.0035 0.0155 0.0146 0.0033 0.0167 0.0037 0.0052 -0.0007 0.0016 0.0126 0.0054 -0.0048 -0.0003 -0.0171 -0.0043 0.0274 -0.0040 -0.0067 -0.0215 -0.0157 0.0075 0.0267 -0.0030 0.0133 -0.0008 0.0124 -0.0120 0.0242 -0.0040 -0.0151 0.0188 -0.0070 0.0037 -0.0122 -0.0039 -0.0172 -0.0013 -0.0249 -0.0149 0.0029 -0.0144 0.0168 0.0067 0.0013 0.0237 -0.0012 0.0098 -0.0008 0.0040 0.0205 -0.0046 0.0016 -0.0149 -0.0069 0.0241 -0.0056 0.0058 -0.0046 0.0009 -0.0020 0.0082 -0.0057 -0.0168 -0.0072 0.0108 0.0082 0.0080 0.0016 0.0157 -0.0100 -0.0023 0.0169 0.0026 0.0020 0.0076 0 0 0.0014 -0.0090 0.0151 0 -0.0027 0.0004 -0.0025 0.0030 0.0005 -0.0163 0.0034 0.0043 -0.0190 0.0072 0.0097 -0.0211 -0.0180 -0.0090 -0.0113 0.0066 -0.0045 -0.0184 0.0123 0.0081 0.0097 -0.0066 -0.0248 -0.0180 0.0093 0.0024 0.0069 -0.0059 -0.0006 0.0019 0.0146 0.0100 0.0057 0.0073 -0.0059 -0.0149 0.0020 -0.0149 0.0119 0.0203 0.0110 0.0071 -0.0039 0.0141 -0.0002 0.0017 0.0086 -0.0014 0.0028 -0.0070 0.0114 0.0089 -0.0020 -0.0050 0.0008 0.0050 0.0036 0.0154 -0.0021 0.0060 -0.0023 0.0018 0.0132 0 0 0.0027 -0.0048 -0.0082 0.0125 0.0002 -0.0032 0.0076 0.0021 -0.0177 -0.0030 0.0164 -0.0054 -0.0099 0.0261 -0.0276 -0.0123 0.0099 -0.0015 0.0051 -0.0263 -0.0081 -0.0085 -0.0332 0.0516 0.0033 0.0239 0.0110 -0.0317 0.0017 0.0146 -0.0479 -0.0066 -0.0041 -0.0236 0.0154 0.0306 0.0015 0.0030 0.0028 -0.0000 0.0122 -0.0193 -0.0057 -0.0062 0.0196 0.0119 -0.0014 0.0127 0.0081 0.0026 0.0053 -0.0011 0.0121 -0.0038 -0.0103 -0.0145 -0.0074 0.0142 -0.0339 0.0023 -0.0183 -0.0040 -0.0031 0.0212 0.0087 0.0071 0.0049 0.0020 0.0186 0.0030 -0.0098 -0.0179 -0.0052 -0.0070 0.0038 0.0250 0.0039 0.0045 0.0021 -0.0046 -0.0072 0.0022 0.0232 0.0025 0.0037 0.0004 -0.0117 0.0146 -0.0103 -0.0213 -0.0031 -0.0040 0.0000 0.0156 -0.0032 -0.0181 -0.0116 0.0010 -0.0126 -0.0061 0.0022 0.0065 -0.0044 0.0264 -0.0000 0.0083 0.0033 -0.0061 0.0076 0.0157 0.0022 -0.0022 -0.0020 -0.0064 0.0136 -0.0030 -0.0108 -0.0038 0.0182 -0.0031 -0.0004 -0.0047 -0.0029 -0.0028 -0.0125 0.0132 0.0088 0.0009 0.0025 0.0028 -0.0008 0.0204 0.0032 0.0057 0.0037 -0.0040 0.0052 0.0132 -0.0008 0.0050 -0.0038 -0.0069 0.0056 0.0075 -0.0055 0.0175 0.0029 -0.0005 0.0055 -0.0101 0.0005 0.0017 0.0082 0.0047 -0.0173 0.0176 0.0082 -0.0045 -0.0223 -0.0014 0.0263 0.0132 -0.0014 0.0010 0.0068 -0.0037 -0.0017 0.0060 0.0033 -0.0003 -0.0016 0.0011 -0.0060 0.0052 0.0084 -0.0014 -0.0014 -0.0124 0 0.0002 0.0033 -0.0117 0 0.0109 -0.0021 -0.0051 0.0060 -0.0048 -0.0132 0.0122 0.0182 0.0009 0.0001 0.0003 0.0092 -0.0085 -0.0083 0.0054 0.0008 -0.0012 0.0096 0.0040 -0.0074 -0.0036 0.0150 -0.0001 0.0014 0.0031 0.0093 0.0054 -0.0003 0.0026 0.0042 0.0034 0.0005 0.0019 -0.0012 0.0029 -0.0142 -0.0005
I know that I probably need to make a loop I'm just not sure how to do this. I could easily count the number of positive and negative numbers by sorting positive = DAX(DAX>0) etc, but thats not what I'm looking for. Please help me compute the number of times that this array changes its sign in successive days.

采纳的回答

Hamoon
Hamoon 2015-9-7
pos = DAX>0;
changes = xor(pos(1:end-1),pos(2:end));
num = sum(changes)
  5 个评论

请先登录,再进行评论。

更多回答(0 个)

类别

Help CenterFile Exchange 中查找有关 Loops and Conditional Statements 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by