Subscripted assignment dimension mismatch

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Shane McNamara
Shane McNamara 2017 年 10 月 25 日
コメント済み: Shane McNamara 2017 年 10 月 26 日
Can anyone highlight why i am getting this error in the below code please?
domainSize = [50 50];
domain = zeros(domainSize);
domain(24:26,24:26) = 1;
% Generate Position Arrays
[particlePosition(:,1), particlePosition(:,2)] =find(domain);
for i = 1:length(particlePosition)
%Select Direction to Move
switch ceil(4 * rand)
case 1
dR = [-1 0];
case 2
dR = [+1 0];
case 3
dR = [0 -1];
case 4
dR = [0 +1];
%New Particle Location
tempPosition = particlePosition + dR;
%Move Particle
particlePosition(i,:) = tempPosition;


Roger Stafford
Roger Stafford 2017 年 10 月 25 日
There are quite a few things wrong with this code.
1) In “for i = 1:length(particlePosition)” you will get only three values of i from 1 to 3, but you have nine “particles” to move.
2) The part of the code that begins with “%New Particle Location” is located outside the for-loop so only the last “particle” is moved.
3) The line “tempPosition = particlePosition + dR;” attempts to add ‘particlePosition’, which is a 9 x 2 matrix to ‘dR’, which is only a 1 x 2 vector. Naturally Matlab will object strenuously to such an ill-advised attempt. This is undoubtedly the source of your error message.
  2 件のコメント
Walter Roberson
Walter Roberson 2017 年 10 月 25 日
Note: since R2016b, adding a 9 x 2 and a 1 x 2 will work, and will be the same as if you had use bsxfun() to do the addition.
Shane McNamara
Shane McNamara 2017 年 10 月 26 日
Thanks for your help :D


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