Error message "Index exceeds matrix dimensions"

Hi, i got the same issue.

I have 3 matrix. the first one is for data vector in matrix [1 2 3 12 11 6 7 8 9 10], the second is for the ii [1 2 3 3 3 7 7 8 9 10] and the last matrix is for the jj (column) [10 2 3 6 8 1 7 3 9 6]

when i creat my function and launch a test with this approach it is work properly... well at least... SOMEONE COULD HELP ME?

afficheMatriceCreuse([1 2 3 12 11 6 7 8 9 10], [1 2 3 3 3 7 7 8 9 10],[10 2 3 6 8 1 7 3 9 6])

i got this error message:

(1,10) 1

(2,2) 2

(3,3) 3

(3,6) 12

(3,8) 11

(7,1) 6

(7,7) 7

(8,3) 8

(9,9) 9

(10,6) 10

Index exceeds matrix dimensions.

Error in afficheMatriceCreuse (line 31)

fprintf('(%i,%i) %i \n', iM(ii),jM(ii),vM(ii))

or Index exceeds matrix dimensions.

Error in afficheMatriceCreuse (line 26)

iM(ii);

Function:

function afficheMatriceCreuse(vM,iM,jM)

for ii = 1:(numel(iM,jM,vM))

(line26) iM(ii);

jM(ii);

vM(ii);

(line31) fprintf('(%i,%i) %i \n', iM(ii),jM(ii),vM(ii))

end

end

Answer 1

[Alex Mcaulley]

Your for loop goes from 1 to the sum of the elements of the three inputs (in your example, 30), then, when ii = 11:

iM(ii);
jM(ii);
vM(ii); 

throws an error, because the size of that arrays is 10x1. I don't know what you are trying to do, but if your inputs are always of the same size, probably yo need to change the limits of the loop to:

for ii = 1:numel(iM)

[Simon Emery]

Hi Alex,

I find my issue yesterday, now it's works properly.

function afficheMatriceCreuse(vM,iM,jM)

for ii = 1:(numel(iM,jM))

for jj = 1: numel(vM)

iM(ii);

jM(ii);

vM(ii);

end

fprintf('( %i, %i) %i \n', iM(ii),jM(ii),vM(ii))

end

end

Answer 2

[Image Analyst]

How about:

% Find out how many rows we should print out, allowing for different sized matrices:
maxNumberOfRows = min(size(iM, 1), size(jM, 1), size(vM, 1)); % Find out the shortest matrix.
% Print header line.
fprintf('(iM, jM)  vM\n');
% Print as many rows as we can.
for row = 1 : maxNumberOfRows
       fprintf('( %d, %d) %d \n', iM(row), jM(row), vM(row));
end