# associative network with 4 memories & 50 neurons
#
# the memories
table x1 % 50 0 49 ((t>=18)&(t<=30))-al
table x2 % 50 0 49 (mod(t,4)==0)-al
# random memories
table x3 % 50 0 49 (ran(1)>.75)-al
table x4 % 50 0 49 (ran(1)>.75)-al
# dot products with each
vdot[1..4]=1.25*sum(0,49)of(shift(v0,i')*x[j](i'))/(50*al*(1-al))
# total activity
vtot=sum(0,49)of(shift(v0,i'))/(al*50)
# nonlinearity
f(i)=fmax*max(tanh((i-gam)/fmax),0)
par fmax=150,gam=-20
par al=.25
v[0..49]'=-v[j]+f(x1([j])*vdot1+x2([j])*vdot2+x3([j])*vdot3+x4([j])*vdot4-vtot)
@ bound=1000
@ total=42
done

# Click on Initconds formUla 
# variable: v[0..49] 
# formula: 5*x1([j])+ran(1)-.5
# use the array plot to see everything - click on V0 and V49 in the
# initial Data Window and then click on ARRY