MATLAB: How to fix “Attempted to access PETTotalKemptcatch(109,:); index out of bounds because size(PETTotalKemptcatch)=[108,5]” error

index out of bounds

Hello, I'm trying to fix the mentioned error in this simple loop. I have a matrix( PETTotalKemptcatch) of 108×5 (Rows: monthly time series from January 2008 to December 2016 and columns: 5 different methods for calculating PET). I need to create a new matrix for extracting January, february, march and so on. Each month matrix will have a size(9,5) cause the data is for 9 years for example PETJanuary(9,5). So, in this case, i will have 9 january, 9 february and so on. The following code is just for January.

The code is giving the matrix well but at the same time is giving me this error: Attempted to access PETTotalKemptcatch(109,:); index out of bounds because size(PETTotalKemptcatch)=[108,5]" . I have tried many ways to fix but i havent been succesful in that.

Thanks

p=1;
for j=1:size(PETTotalKemptcatch,1)
        PETJanuary(p,:)=PETTotalKemptcatch(12*j-11,:);
    p=p+1;
end

Best Answer

It clearly states that you have 108 rows but you‘re trying to access 109th row ? Isn’t that clear?

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MATLAB: Subscript indices must either be real positive integers or logicals – how to change lat/lons from double to integers

If they just need to be indices, you can use ceil, floor, fix or round. eg

x = fix(x)

If you want to convert them to ACTUAL integer types, you can use:

x = uint32(x);

[EDIT] As the question changes...

As Walter pointed out, you are overwriting Z every loop. Perhaps you wanted Z indexed by i and j... In which case:

Z(i,j) = SPI(precip30y_model1(i,j),12,12);

But since you said that Z is empty after iteration, is it possible that SPI() can return an empty set instead of a scalar? In that case:

Z = nan(144,91);
for i=1:size(Z,1)
  for j=1:size(Z,2)
    s = SPI(precip30y_model1(i,j),12,12);
    if ~isempty(s)
      Z(i,j) = s;
    end
  end
end

That uses NaN to represent "no data".

[EDIT 2012-05-23]

Okay, from your comments I think you want this:

Z = nan(144,91);
for i=1:size(Z,1)
  for j=1:size(Z,2)
    Z(i,j) = SPI(squeeze(precip30y_model1(i,j,:)),12,12);
  end
end

MATLAB: Using values in an array to represent characters

Use datetime to generate a vector of datetimes and then use month property,

dt = datetime([2017*ones(12,1) (1:12).' ones(12,1)]);
month_names = month(dt,'name');

now month_names has all your month names,

     12×1 cell array
      'January'
      'February'
      'March'
      'April'
      'May'
      'June'
      'July'
      'August'
      'September'
      'October'
      'November'
      'December'

Extract it just by indexing,

res = month_names([1 2 4 5 6])
res =
    5×1 cell array
      'January'
      'February'
      'April'
      'May'
      'June'

Best Answer

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