Find the average for a matrix excluding data in the first column

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Sarah White
Sarah White 2020-5-11
回答： Image Analyst 2020-5-11
I have a 20x6 matrix and I want to find the average value of the entire range of values (sensor data) but not including the first column (time values) - how can I do this?
This gives me 5 averages (one for each of the sensor data columns).
Totalave=mean(SENSOR(:,2:6))
Thanks in advance

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回答（2 个）

Johannes Hougaard
Johannes Hougaard 2020-5-11
You could simply add another mean around it:
totalave = mean(mean(sensor(:,2:6)));
Or you could introduce a temporary variable (e.g. sensor_data) and use the (:) operator to create a column vector rather than an n-by-m matrix
sensor_data = SENSOR(:,2:end);
Totalave=mean(sensor_data(:));
Image Analyst
Image Analyst 2020-5-11
If you have the Image Processing Toolbox, simply use mean2() instead of mean():
Totalave = mean2(SENSOR(:, 2 : 6))

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