Computes the part of the loglikelihood function relevant to optimizing kappa for step 1
ISOpureS1.model_optimize.kappa.kappa_compute_loglikelihood(kappa, tumordata, model)
a scalar kappa, the strength parameter in the prior over the reference cancer profile
a GxD matrix representing gene expression profiles of tumour samples
list containing all the parameters to be optimized
The part of the loglikelihood function relevant to optimizing kappa