How to apply Principal Component Analysis in Matlab?

Dear all, For normal [2] dimension matrices we use 'princomp' command in matlab. But what command we should use for multispectral images?

Let me explain it in different way: I used ENVI to calculate PCA components for all 3 bands of my multispectral image.

      PCA1      PC2       PC3

1. Red 0.4395 -0.4064 0.1147
2. NIR 1 0.5945 0.5129 0.2489
3. Blue 0.2460 -0.2744 0.2408

1)After applying Procrustes method, how can i get the coefficients(eigen vectors) like above in matlab? 2) How can I apply the Principal Component Analysis in Matlab for multispectral images?

I hope someone will answer my questions!

Regards,