I am having trouble with "Index exceeds matrix dimensions"

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zachary 2016-9-28

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关闭： MATLAB Answer Bot 2021-8-20

Hi, Just wondering if anyone can help me with "Index exceeds matrix dimensions". I have figured out that it means my code is running out of the required dimensions but don't know how to fix it? any ideas?

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zachary 2016-9-28

编辑：Walter Roberson 2016-10-2

在 MATLAB Online 中打开

its a 20x20 array and i have provided the code below

disp('Pattern Map');
for r = 1: Max_Rows 
      for c = 1:Max_Columns 
          if Classification_Map(r,c) == Classification_Map(r,c+1) && Classification_Map(r,c) == Classification_Map(r+1,c) && Classification_Map(r,c) == Classification_Map(r+1,c+1);
              Pattern_Map(r,c) = Classification_Map(r,c);

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Answer 1

Thorsten 2016-9-28

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在 MATLAB Online 中打开

If you have MaxColumns, and c runs from 1:MaxColumns, you try to get c + 1, which is MaxColumns + 1, so you get the error:

MaxColumns = 20; MaxRows = 20;
Classification_Map = zeros(MaxRows, MaxColumns);
c = MaxColumns + 1;
Classification_Map(1, c)
   Index exceeds matrix dimensions.

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zachary 2016-9-29

在 MATLAB Online 中打开

There is a fair amount of code. I have changed the classification map part to cut it down.

                 %rawdata
RawData = dlmread('data-1.csv', ',');
                  %Constants
                  Range_Value_One = 0.4;
                  Range_Value_Two = 0.8;
                  Range_Value_Three = 1.2;
                  Range_Value_Four = 1.6;
                  Range_Value_Five = 2.0;
                  Display_Value_One = 1;
                  Display_Value_Two = 2;
                  Display_Value_Three = 3;
                  Display_Value_Four = 4;
                  Display_Value_Five = 5;
                  %Counts
                  Range_One_Count = 0;
                  Range_Two_Count = 0;
                  Range_Three_Count = 0;
                  Range_Four_Count = 0;
                  Range_Five_Count = 0;
                  Total_Range_Count = 0;
                  Pattern_A_Count = 0;
                  Pattern_B_Count = 0;
                  Pattern_C_Count = 0;
                  Total_Pattern_Count = 0;
                  % Intilise Variables
                  Max_Rows = size(RawData, 2); % the digit 2 tells the code to look at how many rows there are
                  Max_Columns = size(RawData, 1); % the digit 1 tells the code to look at how many columns there are
                  Classification_Map = zeros(Max_Rows,Max_Columns);
                  Pattern_Map = rand(Max_Rows,Max_Columns);
                  Pattern_MapA = char(Max_Rows,Max_Columns);
                  Pattern_MapB = char(Max_Rows,Max_Columns);
                  Pattern_MapC = char(Max_Rows,Max_Columns);
                  MapValue = 0;
                  MapValue1 = 0;
                  MapValue2 = 0;
                  MapValue3 = 0;
                  %Pattern Display Values
                  PATTERN_A = 'A';
                  PATTERN_B = 'B';
                  PATTERN_C = 'C';
                  r = 0; %row number
                  c = 0; %column number
                  % Displaying the Raw Data
                  disp('RawData');
                  for r = 1:Max_Rows
                      for c = 1:Max_Columns
                          value = RawData(r,c);
                          fprintf('%.4f ', value);
                      end
                      fprintf('\n');
                  end
                  %Classification Map 
                  fprintf('\n');
                  disp('Classification Map');
                  for r = 1:Max_Rows
                      for c = 1:Max_Columns
                          if RawData(r,c) <= Range_Value_One
                              Classification_Map = Display_Value_One;
                              Range_One_Count = Range_One_Count +1;
                              Total_Range_Count = Total_Range_Count +1;
                          else if RawData(r,c) <= Range_Value_Two
                                  Classification_Map = Display_Value_Two;
                                   Range_Two_Count = Range_Two_Count +1;
                                   Total_Range_Count = Total_Range_Count +1;
                              else if RawData(r,c) <= Range_Value_Three
                                      Classification_Map = Display_Value_Three;
                                       Range_Three_Count = Range_Three_Count +1;
                                       Total_Range_Count = Total_Range_Count +1;
                                  else if RawData(r,c) <= Range_Value_Four
                                          Classification_Map = Display_Value_Four;
                                           Range_Four_Count = Range_Four_Count +1;
                                           Total_Range_Count = Total_Range_Count +1;
                                      else if RawData(r,c) <= Range_Value_Five
                                              Classification_Map = Display_Value_Five;
                                               Range_Five_Count = Range_Five_Count +1;
                                               Total_Range_Count = Total_Range_Count +1;
                                          end
                                      end
                                  end
                              end
                          end
                          fprintf('%d ', Classification_Map);
                      end
                      fprintf('\n');
                  end
                  % %Pattern Map
                  % fprintf('\n');
                  % disp('Pattern Map');
                  %Pattern A
                   for r = 1: Max_Rows
                       for c = 1: Max_Columns
                          MapValue = Classification_Map(r,c);
                          MapValue1 = Classification_Map(r,c+1);
                          MapValue2 = Classification_Map(r+1,c);
                          MapValue3 = Classification_Map(r+1,c+1);
                          if MapValue == MapValue1 && MapValue == MapValue2 && MapValue == MapValue3
                              Pattern_Map(r,c) = MapValue;
                              Pattern_A_Count = Pattern_A_Count + 1;
                              Total_Pattern_Count = Total_Pattern_Count + 1;
                          end
                      end
                  end

zachary 2016-10-2

Thankyou.

Any ideas how to solve this problem though?

Walter Roberson 2016-10-2

Stop c at Max_Columns-1 and stop r at Max_Rows-1

I am having trouble with "Index exceeds matrix dimensions"

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I am having trouble with "Index exceeds matrix dimensions"

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