polyfitn, problem have coefficent and r2 alone

i have a problem with this exercise please can you help me

i have this matrix1;

metriche=     2.7900    3.1600    3.7100    2.2900    2.4900    2.6400    2.9000    2.7900    2.9100    3.3500        (1 row Loudness)
              0.0256    0.0277    0.0311    0.0246    0.0210    0.0199    0.0194    0.0256    0.0213    0.0208        (2 row fluc.str)
              0.4910    0.6000    0.7280    0.3400    0.4250    0.5150    0.6170    0.4910    0.3890    0.4380        (3 row roughness)
              1.0300    1.1100    1.2100    0.8870    0.9340    0.9540    0.9850    1.0300    1.0400    1.1200        (4  row sharpness)
             39.7000   40.9000   42.6000   38.1000   38.9000   39.5000   40.6000   39.7000   40.3000   41.7000        (5 row  leq)
             29.4000   30.9000   32.9000   26.9000   28.0000   28.8000   30.1000   29.4000   28.8000   30.0000        (6 row  sil)
              0.1330    0.1280    0.1130    0.1530    0.1400    0.1310    0.1180    0.1330    0.2030    0.1800        (7 row tonality)
              2.2000    2.2000    2.2000    2.4400    2.4900    2.4800    2.4500    2.2000    2.3900    2.3800        (8 row kurtosis)

and i have this matrix2

subjective= [7.5000    7.0200    6.9400    7.9100    7.9600    7.9100    7.7800    7.4200    7.8600    7.4700]

i try to obtain the polyfitn, the coefficents,And,R2 but the program say this:

pkurtosissil=polyfitn(metriche([8;6],:)', subjective',1);
coef([8;6],:)=pkurtosissil.Coefficients;
r([8;6])=pkurtosissil.R2;

Unable to perform assignment because the indices on the left side are not compatible with the size of the right side.

[dpb]

I can't find any such function as polyfitn in current ML documentation...

[Nishant Gupta]

Hi dpb,

Yes, you are right there is no function named polyfitn as such in MATLAB but there is a function named polyfitn , which you can find on file exchange using the following link:

https://www.mathworks.com/matlabcentral/fileexchange/34765-polyfitn

Answer 1

[Nishant Gupta]

Hi Gryaa,

If you check the size of pkurtosissil.Coefficients in the workspace, it is [1 x 3] and you are trying to store it in

coef( [8;6] , : ) whose actual size is [2 x 10] . That is why you are gettting the error.

So, you can replace the second line of your code with the following one to get all your coefficients:

coef(1,:)=pkurtosissil.Coefficients;

Similarly, you can do with R2 also.

[mohamed gryaa]

thanks Gupta