Plot is not lined up with the X axis

Hi,

I have a strange problem. My simulatiuon plot is not lined with the x-axis. can anyone please help me for that.

I am attaching the script here and the plot.

Script:

close all;

clear;

clc;

% Defining variables

A = 10; % Total number of transmitters

p = 0.01;

Length_of_packet = 1000; % Maximum packet length in bits

Bitrate = 100; % bit rate for each transmitter in bits/sec

Trasmission_Time = Length_of_packet/Bitrate;

Total_Time = 1000; % Total time for simulation in seconds

Zero_slot_overlapping = 0;

One_slot_overlapping = 0;

Two_slot_overlapping = 0;

Three_slot_overlapping = 0;

Four_slot_overlapping = 0;

Five_slot_overlapping = 0;

Six_slot_overlapping = 0;

Seven_slot_overlapping = 0;

Eight_slot_overlapping = 0;

Nine_slot_overlapping = 0;

Ten_slot_overlapping = 0;

User = zeros(A,Total_Time);

for k = 1:A

%User(k,:) = zeros(1,Total_Time);

for i = 1:(Total_Time-4)

probability_of_transmission = rand(1);

if probability_of_transmission > p

User(k,i) = 0;

else

User(k,i) = 1;

end

end

end

for k = 1:A

X = sum(User(k,:));

end

for k=1:A

idx = find(User(k,:)==1);

[a,b] = size(idx);

for i = 1:b

for j = 1:Trasmission_Time

User(k, (idx(i)+j-1)) = 1;

end

end

end

Y = sum(User);

%Creating row pairs to compare

row_pairs = nchoosek(1:size(User,1),2);

%disp(row_pairs);

n_pairs = size(row_pairs,1);

n_overlaps = zeros(n_pairs,1);

%Finding overlapping and counting them

for ii = 1:n_pairs

n_overlaps(ii,1) = nnz(User(row_pairs(ii,1),:) & User(row_pairs(ii,2),:));

if n_overlaps(ii,1) == 0

Zero_slot_overlapping = Zero_slot_overlapping + 1;

elseif n_overlaps(ii,1) == 1

One_slot_overlapping = One_slot_overlapping + 1;

elseif n_overlaps(ii,1) == 2

Two_slot_overlapping = Two_slot_overlapping + 1;

elseif n_overlaps(ii,1) == 3

Three_slot_overlapping = Three_slot_overlapping + 1;

elseif n_overlaps(ii,1) == 4

Four_slot_overlapping = Four_slot_overlapping + 1;

elseif n_overlaps(ii,1) == 5

Five_slot_overlapping = Five_slot_overlapping + 1;

elseif n_overlaps(ii,1) == 6

Six_slot_overlapping = Six_slot_overlapping + 1;

elseif n_overlaps(ii,1) == 7

Seven_slot_overlapping = Seven_slot_overlapping + 1;

elseif n_overlaps(ii,1) == 8

Eight_slot_overlapping = Eight_slot_overlapping + 1;

elseif n_overlaps(ii,1) == 9

Nine_slot_overlapping = Nine_slot_overlapping + 1;

elseif n_overlaps(ii,1) == 10

Ten_slot_overlapping = Ten_slot_overlapping + 1;

elseif n_overlaps(ii,1) == 11

Ten_slot_overlapping = Ten_slot_overlapping + 1;

One_slot_overlapping = One_slot_overlapping + 1;

end

end

disp([row_pairs n_overlaps]);

B = ([Zero_slot_overlapping; One_slot_overlapping; Two_slot_overlapping; Three_slot_overlapping; Four_slot_overlapping; Five_slot_overlapping; Six_slot_overlapping; Seven_slot_overlapping; Eight_slot_overlapping; Nine_slot_overlapping; Ten_slot_overlapping;] );

T = num2cell(B);

[Zero_slot_overlapping, One_slot_overlapping, Two_slot_overlapping, Three_slot_overlapping, Four_slot_overlapping, Five_slot_overlapping, Six_slot_overlapping, Seven_slot_overlapping, Eight_slot_overlapping, Nine_slot_overlapping, Ten_slot_overlapping] = deal(T{:})

figure(1)

plot(B,'--b');

%legend('10 Users')

legend('10 Users')

xlabel('No of colission');

ylabel('No of times');

axis([0 10 0 10]);

title('Plot for fix packet size with different no. of Users')

grid;

If you run this the plot is like this

Answer 1

[Star Strider]

I am not certain what the problem is. Using plot with only one argument plots the argument with respect to the indices of the argument array. In MATLAB, indices begin with 1, not 0. Provide an independent variable vector as the first argument to plot it against that argument —

x = 0:9;
y = randn(size(x));

figure
subplot(1,2,1)
plot(y)
grid
title('One Argument')
subplot(1,2,2)
plot(x,y)
grid
title('Two Arguments')