# Creating multiple graphs with TMultigraph for N Graphs

Hello, kind of new user here so apologies if question is naive.

I’m Using root for creating a graph of random walks, so far a simple random walk works and I can create a graph for the code, my question comes to how do I scale it to show multiple number of walks using TMultiGraph()

I’m also quite rusty in C++ so if I have to make a for or while loop to declare the walker, that’s something that I don’t know how to do it.

Here’s the code I wrote for it and the graph it creates.

``````// Random Walk
#import <time.h>
{
g = new TGraph();

int i, y=1;
srand(time(NULL));
double p = 0.5;
for(int i=0; i<=100; i++){
if (rand()%2<p){
y +=1;
}
else{
y +=-1;
}
g->SetPoint(i,i,y);
}
g->Draw("AL*");
}

``````

ROOT Version: 6.24.02
Platform: Ubuntu
Compiler: C++

``````{
TMultiGraph *mg = new TMultiGraph();
srand(time(NULL));
for (int j = 0; j < 8; j++) {
TGraph *g = new TGraph();
double p = 0.5;
int y = 1;
for(int i = 0; i <= 100; i++) {
if (rand()%2 < p) y += 1; else y -= 1;
g->SetPoint(i, i, y);
}
g->SetLineColor(j + 1); g->SetMarkerColor(j + 1);