DAPI_image_feature_extraction - error

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Dear Qiuping Xu,

I have recently read paper: 'Automatic stage identification of Drosophila egg chamber based on DAPI images' and tried to run your algorithm for stage determination. After following all the steps given in readme file I received this error:

[area ratio oocyte_size distance]=feature_extraction('example3.tif');
Error using princomp (line 13)
princomp has been removed. Use pca instead.

Error in Cell_area_convex (line 187)
[coeff,score,latent] = princomp(inner1(IN,:));

Error in feature_extraction (line 7)
[major, minor, area, segout, u, I0, seg, boundary]=Cell_area_convex (fname,K,0);

The software version I am using is MATLAB R2018b, I would be very grateful if you could help me and provide a solution for this error.

Many thanks,

Bohdan Lewkow