Could someone please help me create a three-column array?

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Student
Student 2016-4-11
编辑： Image Analyst 2022-10-18
I have "NYC Diseases" data with the following 4 variables:
  1. chickenPox (41x12 double)
  2. measles (41x12 double)
  3. mumps (41x12 double)
  4. years (41x1 double)
The rows are the years, and the 12 columns are the 12 months. I am told to load the NYC diseases data sets (NYCDiseases.mat).
Create variable called diseases that holds a three-column array.
The first column is the monthly counts of measles, the second column is the monthly counts of mumps, and the third column is the monthly counts of chicken pox.
Could anyone help me on how I should approach this type of command? Would I be using the "reshape"?
Thank you. I'd really appreciate help on this.
  1 个评论
Walter Roberson
Walter Roberson 2016-4-11
You have not given us sufficient information about the correspondence between the 41x12 and "monthly counts". If we assume that the 12 corresponds to the 12 months of the year and each row corresponds to a year whose number is given in years then we still need to know whether the array is to have 41*12 rows or if it is to have 12 rows where the counts are total counts per month over all of the years.

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采纳的回答

Roger Stafford
Roger Stafford 2016-4-11
编辑：Image Analyst 2022-10-18
Here is my guess as to what you mean:
M = [mean(measles,1).', mean(mumps,1).', mean(chickenPox,1).'];
Each value in M is the average number of the respective diseases over the 41 year period for the month corresponding to the row number. There will be 12 rows (each row is a different month) and 3 columns for the 3 diseases.

更多回答（2 个）

Mariana
Mariana 2022-10-18
For anyone here looking for this from 2022 and on, its:
diseases = [sum(measles,1).',sum(mumps,1).',sum(chickenPox,1).'];
Azzi Abdelmalek
Azzi Abdelmalek 2016-4-11 
out=[measles(:),mumps(:),chickenPox(:)]

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