Solve a differential equation using a For loop !

Gents, I am trying to solve the following equations(dMB/dt, SB(j) ) , for each stage, in Matlab using a For loop:

dMB/dt = B(j) - B(j-1); % Mass flowrate of brine solution

SB(j) = (1-CB(j)*(0.011311 - 1.146e-05*TB(j)))*SD(j); % specific heat of brine

,where j represents a stage number (e.g. j = 1:N), N = 20(number of stages)

Notice that I have defined, (CB(j),TB(j),SD(j)), for all stages (N)