added solutions to function erecises

programming/code/boltzmann.m

@@ -0,0 +1,8 @@
+function y = boltzmann( x, k )
+% computes the boltzmann function
+% x: scalar or vector of x values
+% k: slope parameter of boltzman function
+% returns y-values of boltzmann function
+y = 1./(1+exp(-k*x));
+end
+

programming/code/plotboltzmann.m

@@ -0,0 +1,3 @@
+p = boltzmann(voltage, a);
+plot(voltage, p)
+y = -1;