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% 19h

% para Atividade 02 - Ex. 1
x = 100 + 4*randn
x = 100 + 6*randn
x = 100 + 8*randn
s = [ 4 6 8 10 12 14 16 18 20 ]
s = [ 4:2:20 ]
x = 100 + s .* randn( size(s) )
round( x )

% para Atividade 02 - Ex. 2
clear
home
x0 = 500
s = 50
x = x0 + s*randn(100,1);
whos
y = zeros(100,1);
for n=1:100
y(n) = mean( x(1:n) );
end
whos
y(1:10)
figure, plot( y, '*-r' )
hold on
plot( [0 100], [500 500], '-k' )

x = x0 + s*randn(100,1);
y = zeros(100,1);
for n=1:100
y(n) = mean( x(1:n) );
end
plot( y, '*-b' )

x = x0 + s*randn(100,1);
y = zeros(100,1);
for n=1:100
y(n) = mean( x(1:n) );
end
plot( y, '*-g' )

x = x0 + s*randn(100,10);
y = zeros( 100, 10 );
for n=1:100
y(n,1:10) = mean( x(1:n,1:10) );
end
whos
plot( y, '*-' )

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% 21h

% para Atividade 02 - Ex. 1
home
x = 100 + 4 * randn
x = 100 + 6 * randn
x = 100 + 8 * randn
s = [ 4 6 8 10 12 14 16 18 20 ] 
s = [ 4:2:20 ] 
x = 100 + s .* randn( size(s) )
round( x )
round( 100 + s .* randn( size(s) ) )

% para Atividade 02 - Ex. 2
clear
home
x = 500 + 50 * randn(100,1);
whos
y = zeros( 100, 1 );
for n=1:100
  y(n) = mean( x(1:n) );
end
whos
figure
plot( y, '*-r' )

clear
home
x = 500 + 50 * randn(100,1);
y = cumsum( 500 + 50*randn(1,100) ) ./ ( 1:100 );
plot( y, '*-r' )

hold on
plot( cumsum( 500 + 50*randn(1,100) ) ./ ( 1:100 ), '*-b' )
plot( cumsum( 500 + 50*randn(1,100) ) ./ ( 1:100 ), '*-r' )
plot( cumsum( 500 + 50*randn(1,100) ) ./ ( 1:100 ), '*-g' )
plot( cumsum( 500 + 50*randn(1,100) ) ./ ( 1:100 ), '*-m' )

figure
hold on
for i=1:100
  plot( cumsum( 500 + 50*randn(1,100) ) ./ ( 1:100 ), '*-c' )
end
plot( cumsum( 500 + 50*randn(1,100) ) ./ ( 1:100 ), '*-r' )