ArgumentError: New columns must have the same length as old columns - julia

Question

I have a problem in the simulation loop. The problem is that new matrices don't have the same length as old variables. I'm not sure if the problem comes from the initial values of the variables or from the simulation loop.
I'm using julia v1.0.3
using Distributions
using DataFrames
n=5000
t=15000
gamma = 2;
delta = 0.057;
betta = 0.99;
alfa = 0.47;
miz = 1;
roz = 0.75;
sigmaz = 0.013;
phi = 0.05;
rok = 0.7;
mie = 1;
roe = 0.7;
sigmae1 = 0.05;
sigmae2 = 0.1;
roez = 0.3;
lambda = 0.8;
tau = 0;
ass = 31.7838916986589918973;
kss = lambda*ass;
vtheta1 =0.1;
vtheta2 =0.2;
vtheta3 =0.3;
vtheta4 =0.4;
vtheta5 =0.5;
n_lambda = trunc(Int, lambda * n)
eshocks1= rand(Normal(0.0,sigmae1),n_lambda ,t);
eshocks2= rand(Normal(0.0,sigmae2),n-n_lambda,t);
zshocks1= rand(Normal(0.0, sigmaz),1 , t);
# Variables:
a=ones(t,n);
c=ones(t,n);
y= ones(t,n);
k=ones(t);
w=ones(t);
r=ones(t);
z=ones(t);
l=ones(t);
e=ones(t,n);
Initial values of the variables:
a[1:2,1:n_lambda].=ass;
a[1:t,(n_lambda+1):n].=0;
k[1:2].=lambda*ass;
c[1:n_lambda,1].=(ass^alfa)*(1-tau*alfa)-delta*ass;
Loop of simulation
for i = 2:(t-1)
k[i]=lambda*mean(a[i,1:n_lambda]);
z[i]=(1-roz)+roz*z[i-1]+zshocks1[i];
l[i]=1+(1-lambda)*roez*(z[i]-1)/(1-roe);
w[i]=(1-alfa)*z[i]*((k[i])^(alfa))*l[i]^(-alfa);
r[i]=alfa*z[i]*((k[i])^(alfa-1))*l[i]^(1-alfa);
for j=1:n_lambda
e[i,j]=(1-roe)+roe*e[i-1,j]+eshocks1[j,i];
a[i+1,j]=(vtheta1)+(vtheta2)*a[i,j]+(vtheta3)*e[i,j]+(vtheta4)*z[i]+(vtheta5)*k[i];
y[i,j]=(1-tau)*r[i]*a[i,j]+w[i]*e[i,j];
end
for m=1:(n-n_lambda)
e[i,m+n_lambda]=(1-roe)+roe*e[i-1,m+n_lambda]+roez*(z[i]-1)+eshocks2[m,i];
c[i,m+n_lambda]=w[i]*e[i,m+n_lambda]+tau*r[i]*k[i]/(1-lambda);
y[i,m+n_lambda]=c[i,m+n_lambda];
end
end
Preparing the variables for the calculation of the Gini index
ysort = ones(t,n);
for i = 1:(t-1)
ysort[i,:]=sort(y[i,:]);
end
Calculation of the Gini index of income
giniY=ones(t);
for i=1:(t-1)
sum1=0;
sum2=0;
for j=1:n
sum1=(n+1-j)*ysort[i,j]+sum1;
sum2=ysort[i,j]+sum2;
end
giniY[i]=(n+1-2*(sum1/sum2))/n;
end
tab = DataFrame()
tab[ :periodos] = 15000
tab[ :familias] = 5000
tab[ :giniY]= giniY
return tab
ArgumentError: New columns must have the same length as old columns
Stacktrace:
[1] insert_single_column!(::DataFrame, ::Array{Float64,1}, ::Symbol) at /home/jrun/.julia/packages/DataFrames/IKMvt/src/dataframe/dataframe.jl:366
[2] setindex!(::DataFrame, ::Array{Float64,1}, ::Symbol) at /home/jrun/.julia/packages/DataFrames/IKMvt/src/dataframe/dataframe.jl:420
[3] top-level scope at In[1]:104

Answer 1

This is the way to create tab DataFrame you want (assuming you want periodos and familias columns to contain constant values):
tab = DataFrame(periodos=15000, familias=5000, giniY=giniY)