How do you link a function

I would like to link these two functions together. Where N=3 and Np=4. So i expect 4 groups of 3x3 xy coordinates. I would like to plot each groupcoor vector on the same plot. This is not working.. Is there another way to do this?

function [x,y]=get_number(N)
%Where N is the total number of steps
x(1)=0;
y(1)=0;
%Where STP is the steps. 
%The first step is the the coordinates (0,0)

for i=2:N
    x(i)= rand()
    y(i)= rand()
    groupcoor=[x' y']
    hold on
end
%pos is the position of the prisoner with every step that they take. 
%Every step accounts for one second.
pos= [x', y'];
figure
plot(x',y');

hold on

end
%New function on another script called randomcheck
function [CoordinateGroup]=randomcheck(N,Np)
%[x,y] =get_xy_velocities(N);

hold on
for i=1:Np
    Path=get_number(N)
    CoordinateGroup(i)=Path
    

hold on
   % x_end=[vector(:,end)]
   % y_end=[vector(:,end)]
   % x_end(i)=[x(N,end)]
    %y_end(i)=[y(N,end)] 
   
end

[Dameon Solestro]

Path only gives an array of the x values, why is that??

Answer 1

[Walter Roberson]

function [x,y]=get_number(N)

get_number returns two 1 x floor(N(1)) outputs (unless N(1) < 1, in which case it returns two 1 x 1 outputs)

    Path=get_number(N)

You are only storing one of the outputs, which would correspond to x.

    CoordinateGroup(i)=Path

And you are expecting that 1 x N vector to fit within the single output location CoordinateGroup(i)

Perhaps you want to store into a cell array, CoordinateGroup{i} = Path after having constructed Path from the x and y outputs of get_number()

Where N=3 and Np=4. So i expect 4 groups of 3x3 xy coordinates

But your function get_number returns two 1 x N, not N x N or three 1 x N .

[Dameon Solestro]

I do create the loop. But i want the end xy values of groupcoor. I was thinking I could do something like

for i=1:Np
    
    x_end(i)=vector(:,end)
    y_end(i)=vector(:,end)
    
hold on

   
end

but this doesnt work.

[Dameon Solestro]

it only loops once and then collects the end 4 times

[Walter Roberson]

Your current code has no variable named vector and no variables named x_end or y_end so I do not know where you intend that code to go.

Also, vector(:,end) on both lines will be the same value, so x_end(i) and y_end(i) would get assigned the same thing.

If you are expecting vector to be 1 x something then it confuses the readers that you use the : index . If you want the last element of a vector named vector then use vector(end)

[Dameon Solestro]

sorry i wanted to create an array called x_end for the end points of x

so

i thought

x_end(i)=x(end)

would be useful. but its not. it only uses the first loop's answer

so far i have this

function [x,y]=get_number(N)
%Where N = 3
x(1)=0;
y(1)=0;

%The first step is the the coordinates (0,0)
for i=2:N
    x(i)= rand()
    y(i)= rand()
    groupcoor=[x' y']
    hold on
end

hold on
end
%New function on another script called randomcheck
function [CoordinateGroup]=randomcheck(N,Np)
%Where N=3 and Np=4
end
[x,y] =get_number(N);
hold on
for j=1:Np
    CoordinateGroup=get_number(N)
    x_end(j)=x(end)
hold on
 
   
end

[Walter Roberson]

    groupcoor=[x' y']

The array groupcoor is never used after it is assigned to.

   [x,y] =get_number(N);

Okay, that's good.

      CoordinateGroup=get_number(N)

You are calling get_number(N) again, getting new random points, but you are discarding the y output of get_number() and assigning the x to CoordinateGroup . You never use CoordinateGroup after that.

      x_end(j)=x(end)

Your call to get_number() in the loop is not assigning to x, so the x being referred to in x(end) is the x that was returned by the [x,y] = get_number(N) before the loop.

[Dameon Solestro]

for the last one. how do i use the x's within the loop then??

[Walter Roberson]

      x_end(j) = CoordinateGroup(end);

[Dameon Solestro]

sorry, last question.. but is there also a way to get y_end(j) then??

[Walter Roberson]

I wrote before:

"You are calling get_number(N) again, getting new random points, but you are discarding the y output of get_number()"

Perhaps if you did not discard the y output of get_number() ?

[Dameon Solestro]

but the first function, my outputs should be x,y (??) so then, how would y be kept?

[Walter Roberson]

      [x_end(j), y_end(j)] = CoordinateGroup(end);