error in pca code

hello I am trying to determine the pca graph for a couple of images but I get errors:

rng 'default'

M = 7; % Number of observations

N = 5; % Number of variables observed

X = rand(M,N);

% De-mean

X = actin2.tif

% Do the PCA

[coeff,score,latent] = pca(X);

% Calculate eigenvalues and eigenvectors of the covariance matrix

covarianceMatrix = cov(X);

[V,D] = eig(covarianceMatrix);

errors

>> untitled

Unable to resolve the name 'actin2.tif'.

Error in untitled (line 1)

coeff = pca(actin2.tif)

I want to classify the images by the different morphology.

Answer 1

[Bora Eryilmaz]

You have to use the imread function to read the content of the image into a matrix. See imread.

So instead of

X = actin2.tif

you need

X = imread('actin2.tif')