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Time Series MT 2.1
Handling non-numbers when reading data from Excel
I would like to compute a simple ratio from two datasets:
(pb - pa) / 2
I have some missing values in each series that are non-values. I would
like to not compute this ratio when pb or pa have "no value"
The series are loaded from xlsx, and I use the following command:
vls = reshape(error(0),9,1); vls =9999.99; /* To convert all occurrences of #DIV/0! to 9999.99, and all other empty cells and special types to GAUSS missing values */ pa = xlsreadm("C:\\Gauss8.0\\myfiles\\german_pa.xlsx","b1",1,vls); pb = xlsreadm("C:\\Gauss8.0\\myfiles\\german_pb.xlsx","b1",1,vls);
But applying this synthax is not good, it compute the ratio because the
9999.99 is obviously a value... I do not find the good synthax
Somebody can help me?
I believe that if you do not explicitly set the <tt>vls</tt> parameter, all instances of DIV/0, Nan, missing values etc will be converted to a GAUSS missing value. Pass in an empty string for vls
vls = ""; pa = xlsreadm("C:\\Gauss8.0\\myfiles\\german_pa.xlsx","b1",1,vls); pb = xlsreadm("C:\\Gauss8.0\\myfiles\\german_pb.xlsx","b1",1,vls);
Then the elements with missing values will not compute the ratio, for example if after loading from your Excel sheet:
pa = 10 5 . 8 3 pb = 2 3 9 . 1
Then (pa - pb)/2 =:
4 1 . . 1
If you want to remove the rows with missing values, you can use the packr function.