combining text and numeric matrices

6 次查看（过去 30 天）

Hasnain Ali 2018-2-7

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/381291-combining-text-and-numeric-matrices

评论： Walter Roberson 2018-2-9

My dataset has 6 predictors (all ordinal text values e.g. good, better, best) and 1 response (ordinal numeric value e.g. 1,2,3) column. When I’m trying to combine these into 7 columns for further classification study, I’m shown the following error ’ Error using horzcat Dimensions of matrices being concatenated are not consistent. ’ Any suggestion?

10 个评论
显示 8更早的评论隐藏 8更早的评论

Hasnain Ali 2018-2-9

Oh! I have R2015b version. Walter Roberson, is there any other method you'd know of?

Walter Roberson 2018-2-9

Re-read your documentation. For R2015b: https://www.mathworks.com/help/releases/R2015b/stats/mnrfit.html#inputarg_Y

Response values, specified as a column vector or a matrix. Y can be one of the following:

An n-by-k matrix, where Y(i,j) is the number of outcomes of the multinomial category j for the predictor combinations given by X(i,:). In this case, the number of observations are made at each predictor combination.
An n-by-1 column vector of scalar integers from 1 to k indicating the value of the response for each observation. In this case, all sample sizes are 1.
An n-by-1 categorical array indicating the nominal or ordinal value of the response for each observation. In this case, all sample sizes are 1.

请先登录，再进行评论。

请先登录，再回答此问题。

回答（1 个）

Kai Domhardt 2018-2-7

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/381291-combining-text-and-numeric-matrices#answer_303888

在 MATLAB Online 中打开

I am going to assume, that your predictors matrix is of type 'm x 6 Cell'.

temp = randi(3,10,6);
predictors = cell(10,6);
predictors(temp==1) = {'good'};
predictors(temp==2) = {'better'};
predictors(temp==3) = {'best'};
response = randi(3,10,1);

This results in:

predictors = 
  {'good'  }    {'good'  }   ...
  {'better'}    {'best'  }   ...
    ...          ...

and

response = 
  1
  2
  ...

When you want to combine them you, need to convert your numerical array 'response' into an cell array to match the type of 'predictors':

combined = [predictors, num2cell(response)];

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Hasnain Ali 2018-2-8

Hey Kai Domhardt! Thank you. This is helpful.

However, I'm not able to perform logistic regression over the dataset. Can logistic regression be performed on ' combined' matrix that you've just generated?

请先登录，再进行评论。

请先登录，再回答此问题。