How to be able to plot all the data in Matrix and the the mean of matrix in Matlab?

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I want to plot my data for PCA.
For ex/ I have 100*50 matrix.
Im now sure, but may be we can consider the column as the features (features = 50).
And for the row, I may be the training data.
So we have 100 training data/image. And I also have mean from my initial matrix.
So, now, Im going to plot each data(100) for every feature (50) and also the mean at the same figure.
Can u please help me solve this Master ;)
I really appriciate any help
Tanya on 17 Feb 2014
Here is my code
[a,InputMatrix] = sort(rand(100,50)); %ROW=100 COLUMNS=50
[CovarianceMatrix]= cov(InputMatrix);
[EigVector,EigValue] = eigs(CovarianceMatrix);
From that code, I have 100 rows and 50 columns.
Im going to do PCA for mechine learning.
So I have to reduce the dimensionality of my data (in this case represents by a matrix).
I dont know exactly what is column and row of matriks represent as. But I guess, the Column will be as the kind of features and the Row will be the training data.
I already calculate the mean of my input matrix. And the are eigenvector 1 & eigenvector2. Which are the first and second colomn of EigVector
And know, I have to visualize my matrix, the mean, and the eigenvector (as a line) in 2D space in the same figure (at one figure).
How to do that??

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