Re: Mstrix dimesions not matched

[James Sherman Jr.]

On Wed, Oct 10, 2018 at 4:17 AM jin law <address@hidden> wrote:

data

1874,1092,2510,1624,1895,1323

2611,1097,3202,2683,2346,1522

3939,1728,3566,2737,3116,1803

3970,1930,3685,2871,3312,2569

4455,1956,3987,2985,4009,2607

4610,1997,4034,3554,4514,2734

4845,2563,4562,4078,4593,2933

5775,3139,5127,4273,4739,4067

5930,3851,5215,4771,5461,4407

6102,4129,6176,5094,5576,5373

6376,4406,6505,5127,5849,5608

6701,4598,6734,5628,5942,6621

6934,4891,7066,6421,6939,6858

7284,4979,7729,6800,6982,7326

7441,5634,7975,7341,7870,7631

7871,6202,8071,7658,8371,7770

8248,7136,8149,8045,8650,8176

8443,7483,8236,8583,8836,8276

8828,7790,8709,8605,9519,8639

8882,9524,9166,9782,9644,9349

 

Data

 

1837,1372,2114,1097,2788,1052

2099,1725,2567,1217,2878,1195

3886,2547,2827,1729,3176,1300

4080,2670,3623,1833,3194,1626

4400,2974,4232,2386,3790,1659

4794,3111,5100,3104,4010,1675

5036,3594,5236,3503,4381,1973

5423,3702,5602,3761,4706,2072

5665,3922,6192,3988,5171,2188

5785,4468,6234,4410,5750,4312

5974,4903,6400,4578,5962,4834

6038,5238,6471,5260,5978,4898

6322,6946,6648,5715,6256,5356

7016,7186,7044,6928,7169,6267

7392,7468,7110,7002,7182,6860

7979,7818,8062,7726,8822,6911

8067,8007,8154,8283,8950,7375

9055,8201,8420,8845,8986,7382

9526,8220,8855,9195,9300,9479

9904,8247,9463,9647,9757,9497

 

 

 

for j=1:6;

y=Data(:,j);

X=[ones(20,1),data(:,j)];

theta(:,j)=round(pinv(X'*X)*X'*y);

Theta=theta(1,1:j);

end

>> Theta

Theta =

 

   -512   1051    105  -1324    205  -1106

 

>> for j=1:6;

y=Data(:,j);

for j=1:6;

X=[ones(20,1),data(:,j)];

theta(:,j,j)=round(pinv(X'*X)*X'*y);

Theta=theta(1,1:j,1:j);

end

end

>> Theta

Theta =

 

ans(:,:,1) =

 

  -3562   1051    105  -1324    205  -1106

 

ans(:,:,2) =

 

     0  -541     0     0     0     0

 

ans(:,:,3) =

 

      0      0  -3648      0      0      0

 

ans(:,:,4) =

 

      0      0      0  -2011      0      0

 

ans(:,:,5) =

 

      0      0      0      0  -2469      0

 

ans(:,:,6) =

 

      0      0      0      0      0  -1106

 

 

I found that the above results I got was not right,

something missing in my code, please help me.

 

Thank,

Jin

 

 

 

 

Sent from Mail for Windows 10

 

Hi Jin,

When asking for help, you need to assume that we don't know what you are trying to do.  What do you expect the output of your code to be?  What do you expect Theta to be, how do you know it is not right?  Also, in general, it is helpful for those that are trying to help you to provide a minimum working example (https://en.wikipedia.org/wiki/Minimal_working_example) that demonstrates the error that you are seeing.  For example, are you seeing the issue with a smaller matrix or only for the size that you provide?

James Sherman Jr.