Matrix dimension problems in Genetic programming. N.B I am not referring to Genetic algorithm

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Honey Adams 2018-8-13

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https://ww2.mathworks.cn/matlabcentral/answers/414716-matrix-dimension-problems-in-genetic-programming-n-b-i-am-not-referring-to-genetic-algorithm

评论： Honey Adams 2018-8-15

gptips2.zip

I am implementing the genetic programming toolbox version 2 from https://sites.google.com/site/gptips4matlab/home to generate model structures for a set of data. In the zip folder, I have my dataset and configuration file as well as my function file labelled as Opinionmining_dataset, gpdemo5_config.m and gpdemo5.m . By following the examples specifically demo4. I made my own demo which is the demo5. The problem I have now is when I run the mygpdemo5.m. it runs to a certain point and gives me the error below. I would be glad if anyone could assist. Thank you.

Index exceeds matrix dimensions.
Error in gpmodel2struct>regressmulti_fitfun_full_stats (line 477)
        eval(['geneOutputsTest(:,ind)=' evalstr{i} ';']);
Error in gpmodel2struct (line 253)
gpmodel = regressmulti_fitfun_full_stats(gpmodel,evaltreestrs,gp,rtnVals,tbxStats);
Error in gpfinalise (line 63)
        gpmodel = gpmodel2struct(gp,i,false,false,false);
Error in rungp (line 148)
    gp = gpfinalise(gp);

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Walter Roberson 2018-8-14

在 MATLAB Online 中打开

I did run the code. It fails on

eval(['geneOutputsTest(:,ind)=' evalstr{i} ';']);

when evalstr{i} is 'minus(minus(gp.userdata.xtest(:,5),exp(gp.userdata.xtest(:,3))),square(square(gp.userdata.xtest(:,4))))' but gp.userdata.xtest is something with only one column instead of 5.

I traced back, and the use of eval() is hard-wired into the way that the code works. It generates random character vectors and does random text replacement on them, and does mutations and cross-overs at the text level. The code would require some concerted effort to be rewritten to avoid using eval().

Honey Adams 2018-8-14

awwww.I contacted the Developer but I haven't gotten any response yet.I hope to hear from him soon.

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Answer 1

Walter Roberson 2018-8-14

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/414716-matrix-dimension-problems-in-genetic-programming-n-b-i-am-not-referring-to-genetic-algorithm#answer_332653

在 MATLAB Online 中打开

You have

gp.userdata.ytest = tstS;
gp.userdata.xtest = tsty;
gp.userdata.xval = ValS;
gp.userdata.yval = Valy;

in the second block of code, the variable ending with 'y' is assigned to a field mentioning 'y', and the variable ending with 'S' is assigned to a field mentioning 'x'. But in the first block of code, the variable ending with 'y' is assigned to a field mentioning 'x', and the variable ending with 'S' is assigned to a field mentioning 'y'. There are no comments that might explain why tstS corresponds to Valy and tsty corresponds to ValS.

The xtest that gets assigned is 2 x 1. The ytest that gets assigned is 2 x 5.

The code that runs errors out when trying to access column 5 of xtest.

We can speculate that you made a mistake related to the data or to this section of the code.

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Honey Adams 2018-8-14

I use Matlab2014a and I have the symbolic math toolbox installed. That should suffice for now. The code works with my current version since I don't have the newer versions of Matlab.

Honey Adams 2018-8-15

Hello Walter, I posted a subquestion on the toolbox here https://www.mathworks.com/matlabcentral/answers/414768-developing-a-fitness-function-for-evolved-models-in-genetic-programming. I would be glad if you could check it out.

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