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annotate m-toolbox/classes/@ssm/blockMatRecut.m @ 34:03d92954b939 database-connection-manager

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author Daniele Nicolodi <nicolodi@science.unitn.it>
date Mon, 05 Dec 2011 16:20:06 +0100
parents f0afece42f48
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Daniele Nicolodi <nicolodi@science.unitn.it>
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1 % cuts a matrix into blocks stored inside cell array
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Daniele Nicolodi <nicolodi@science.unitn.it>
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2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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3 %
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Daniele Nicolodi <nicolodi@science.unitn.it>
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4 % DESCRIPTION: blockMatRecut cuts a matrix into blocks stored inside cell
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Daniele Nicolodi <nicolodi@science.unitn.it>
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5 % array. Blocks with zeros are nullified, except in the diagonal (to
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Daniele Nicolodi <nicolodi@science.unitn.it>
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6 % preserve information on matrix size)
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7 %
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8 % CALL: [cell3] = ssm.blockMatRecut(mat1,rowsizes,colsizes)
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9 %
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Daniele Nicolodi <nicolodi@science.unitn.it>
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10 % INPUTS:
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Daniele Nicolodi <nicolodi@science.unitn.it>
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11 % mat1 - numeric array to be cut in pieces
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Daniele Nicolodi <nicolodi@science.unitn.it>
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12 % rowsizes - vector giving block height
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13 % colsizes - vector giving block width
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14 %
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15 % OUTPUTS:
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16 % cell3 - cell array of matrices representing a matrix by blocs.
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17 % blocs may be empty
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18 %
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19 % NOTE : function is private to the ssm class
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20 %
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21 % VERSION: '$Id: blockMatRecut.m,v 1.5 2011/04/08 08:56:23 hewitson Exp $'
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22 %
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23 % TO DO :
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24 % check ME in case of mixed symbolic and double
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25 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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26
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27 function a_out = blockMatRecut(a, rowsizes, colsizes)
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28 % to deal with matrices whose size is not defined
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Daniele Nicolodi <nicolodi@science.unitn.it>
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29 rowrank = cumsum([1 rowsizes]);
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30 colrank = cumsum([1 colsizes]);
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31 Nrow = length(rowsizes);
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32 Ncol = length(colsizes);
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33 a_out = cell(Nrow, Ncol);
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34
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35 for i=1:Nrow
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36 for j=1:Ncol
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Daniele Nicolodi <nicolodi@science.unitn.it>
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37 % getting position
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Daniele Nicolodi <nicolodi@science.unitn.it>
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38 rowmin = rowrank(i);
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39 rowmax = rowrank(i+1)-1;
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40 colmin = colrank(j);
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41 colmax = colrank(j+1)-1;
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Daniele Nicolodi <nicolodi@science.unitn.it>
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42 % selecting data
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43 content = a(rowmin:rowmax, colmin:colmax);
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44
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Daniele Nicolodi <nicolodi@science.unitn.it>
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45 % filling block data
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46 if min(i, Ncol)==min(j, Nrow)
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Daniele Nicolodi <nicolodi@science.unitn.it>
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47 % if we are on the extended diagonal
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48
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49 if isa(content, 'sym')
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50 % try convert the sym to a double
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51 try
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52 a_out{i,j} = double(content);
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53 catch
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54 a_out{i,j} = content;
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55 end
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56 else
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57 % cut a piece and keep the class appartenance (ex for logical)
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58 a_out{i,j} = content;
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59 end
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60
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61 else
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62
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63 % if we are not on the extended diagonal
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64 if isempty(content)
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65 % delete it if it is empty
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66 a_out{i,j} = [];
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67 elseif isa(a, 'sym')
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68 try
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69 % try convert the sym to a double
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70 content = double(content);
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71 if norm(content)==0
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Daniele Nicolodi <nicolodi@science.unitn.it>
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72 % delete it if it is a double filled with zeros
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73 a_out{i,j} = [];
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74 else
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75 a_out{i,j} = content;
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76 end
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77 catch
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78 a_out{i,j} = content;
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79 end
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80 elseif isa(content, 'logical')
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81 % keep the logical as it is
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82 a_out{i,j} = content;
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83 elseif norm(content)==0
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84 % delete it if it is a double filled with zeros
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85 a_out{i,j}=[];
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86 else
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87 % copy it is a non-zero double
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88 a_out{i,j} = content;
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89 end
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90
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91 end
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92
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93 clear content
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94 end
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95 end
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96 end