Dear Dr. Zalesky,

Thank you for the wonderful toolbox. Upon running, I received three warnings: Rank deficient, rank = 50, Rank deficient, rank = 51, and Matrix is singular to working precision. Could you please tell me why these warnings are present?

I have 51 subjects, and two task conditions, within-subject design and thus I am doing a paired sample t-test. For convenience, I have uploaded the design matrix here (first column is the task condition, remaining columns are subject means). The order of my connectivity input is

subj1 cond1
subj1 cond2
subj2 cond1
subj2 cond2
...
subj51 cond2

The contrast is [1 0 0 ...0] (52 elements total).  Thank you for your help!

Best,

Alex