Re: Manipulate financial data - dimensions mismatch

[Carlo de Falco]

On 19 Nov 2009, at 14:04, babelproofreader wrote:

> Could anyone tell me what this error means?
>
> error: A(I,J,...) = X: dimensions mismatch
> error: called from:
> error:  /home/andrew/Documents/forex_convert/tick_to_min.m at line  
> 105,
> column 25

it means what it says: you are trying to assign values to part of an  
array, but the
dimensions of the lhs and rhs of the assignment do not match

> The code that produces it is
>
> [i,j]=find(fMM>=45 & fMM<50);
> min_5_vec(1:length(i),1)=tick_data(min(i):max(i),1);   % line 105

to help debug this, you can change it as follows:
[i,j]=find(fMM>=45 & fMM<50);
try
 min_5_vec(1:length(i),1)=tick_data(min(i):max(i),1);   % line 105
catch
 fprintf ("size of lhs:")
 size (1:length(i))
 fprintf ("size of rhs:")
 size (min(i):max(i))
 error (lasterr)
end_try_catch

so that you get a mor informative error message

> The code checks the "minutes" vector fMM and should extract and  
> create a new
> "min_5_vec" vector containing all tick data that occurred between  
> the times
> HH:45:00 and HH:49:59 for every hour. The thing is this code, which  
> is part
> of a function, appears to fail only on this particular line which I  
> find
> very strange as it has been copied and pasted and only the figures  
> 45 and 50
> have been changed, and the other similar parts of the function code  
> up to
> line 105 do not fail. I have visually checked the raw data and can  
> see no
> cause for the nature of the data to be the reason for the failure.


HTH
c.