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## How to get a trend surface function from raw data

**From**: |
alessio31183 |

**Subject**: |
How to get a trend surface function from raw data |

**Date**: |
Fri, 5 Jan 2018 08:43:57 -0700 (MST) |

Dear all,
I'm quite new in octave env and this is the first post for me.
Basically I have this issue.
I've designed a new sensor where, unlikely, a temperature change makes a
change in reading.
Of course I need to compensate this unwanted behavior.
I did some tests to make this table that is the error in measurement in
[°/°C]
Angle ° 5°C 25°C 50°C
181.10 0.0184 0.0000 -0.0167
219.56 0.0041 0.0000 -0.0010
263.90 -0.0153 0.0000 0.0193
5.45 -0.0151 0.0000 0.0173
48.17 0.0028 0.0000 -0.0042
77.03 0.0141 0.0000 -0.0179
124.98 0.0229 0.0000 -0.0252
165.05 0.0155 0.0000 -0.0275
Now I need to make the surface trend function and to implement it in
firmware in order to compensate the wrong value.
Usually the temperature effect is just function of temperature, so a simple
trend line (linear or polynomial)
Not in this case where the error is temperature and angle function, so a
surface function.
What I ask you is a method to get the function in octave (commands and so
on).
Thanks in advance
--
Sent from: http://octave.1599824.n4.nabble.com/Octave-General-f1599825.html

**How to get a trend surface function from raw data**,
*alessio31183* **<=**