adding values to vector
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Hello, I have this vector that is constantly changing values for instance the below output might look something like
v =
4 15
3 15
3 16
3 15
2 15
And this will continue to happen till the step size is reached. I do not want any value in the array to repeat ! How do I do this? So 3 15 was repeated twice, I want to force the program to move to a different coordinate versus repeating values. See code below
if true
%Random walk in 2D, periodic boundaries
%The script simulates a random walk with periodic boundary conditions. The
xmax = 20; %grid size
ymax = 20; %grid size
nsteps = 400; %number of steps in the simulation
x = round(5);
y = round(15);
plot(x,y,'bo')
ht = title('Steps taken = 0');
h = [];
axis([0.8 xmax+0.2 0.8 ymax+0.2])
hold on
v=[]
for i = 1:nsteps
d = randi(4); %direction (north(1), west(2), south(3), east(4))
dx = 0;
dy = 0;
switch d
case 1
dy = 1;
case 2
dx = -1;
case 3
dy = -1;
case 4
dx = 1;
end
nx = x + dx;
ny = y + dy;
v(end+1,:)=[nx,ny] %Recording all the steps take
%Now apply periodic boundary conditions
if nx<1
x = x + xmax;
nx = nx + xmax;
elseif nx>xmax;
x = x - xmax;
nx = nx - xmax;
end
if ny<1
y = y + ymax;
ny = ny + ymax;
elseif ny>ymax;
y = y - ymax;
ny = ny - ymax;
end
%Draw a line from the current position to the next position
if ~isempty(h)
set(h,'MarkerEdgeColor','b')
end
line([x nx],[y ny])
h = plot(nx,ny,'r*');
set(ht,'String',['Steps taken = ' num2str(i)])
x = nx;
y = ny;
pause(0.1) %the pause that refreshes
end
hold off
end
采纳的回答
Azzi Abdelmalek
2014-11-19
编辑：Azzi Abdelmalek
2014-11-19
unique(v,'rows')
%Or maybe you want something like this:
v=[4 15; 3 15]
c=[3 15]
if ismember(c,v,'rows')
%skip
else
%do
end
3 个评论
Jessica Benidict
2014-11-19
Azzi Abdelmalek
2014-11-19
Your comment is not clear
Image Analyst
2014-11-19
Maybe
if matrix1(row, column) == matrix2(row, column)
??? But like Azzi said, it's not clear what you want. If the matrices are floating point numbers, be sure to read the FAQ.
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