I have a problem with plugging values into array variable

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Ilay Green
Ilay Green 2023-7-29
评论： Walter Roberson 2023-7-30
Hey everyone.
im trying to get values of a certain variable for 24 hours. i have latitude, longitude, height and time.
my latitude and longitude values are floats (number with decimal, e.g, 34.6796000000000,34.7128980000000,34.7462010000000,34.7794990000000
And the class of the variables that stores them (seperately, i have longitude var and latitude var) is "double"
im trying to plug these into a variable that is an array with 4 dimensions.
variable name is pm25_var(lon,lat,height,time) ("4D-single")
when im trying to plug certain coordinates like this:
firstday = pm25_var(Longitude(25),Latitude(114),1,1:24);
when 25 and 114 are the indexes of the values i want
i get this:
"Index in position 1 is invalid. Array indices must be positive integers or logical values."
how can i use the exact coordinates without rounding it into an integer?
thanks in advance

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Stephen23
Stephen23 2023-7-29
firstday = pm25_var(25,114,1,1:24);
  2 个评论
Ilay Green
Ilay Green 2023-7-30
thanks! the answer I get looks like this, so i wondered if it did take the relevant coordinates:
val(:,:,1,15) =
36.6845
Thank you :)
Walter Roberson
Walter Roberson 2023-7-30
Remember that MATLAB only automatically collapses trailing dimensions, so when you index a variable at (scalar, scalar, scalar, vector) then the result you get out is going to be 4 dimensional with the first 3 dimensions all singular.
See also squeeze and reshape and permute

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