Create 100 random particles(all the same size) in an empty plot with dimensions (x-axis from -16 to 16) and (y-axis from -16 to 16) and (angle from 0 to 2*pi)

Create 100 random particles(all the same size) distributed uniformly in an empty plot with dimensions (x-axis from -16 to 16) and (y-axis from -16 to 16) and (angle from 0 to 2*pi). I must avoid the furniture or the obstacles in my map so my map function as below:

xw=-16; xe=16; ys=-16; yn=16; %map dimensions, west, east, south, north
mrx=0.05; mry=0.05; % map resolution {x,y}
[xm ym]=meshgrid(xw:mrx:xe,ys:mry:yn);

m=0*xm.*ym;  % initialize the map m

for i=1:size(xm,2)
    for j=1:size(ym,1)
        r=sqrt(xm(1,i)^2+ym(j,1)^2);
        ang=atan2(ym(j,1),xm(1,i))+pi;
        if 9<=r && r<=10 && (pi/15<=ang && ang<=29*pi/15)
            m(j,i)=1;
        elseif 6<=r && r<=7 && ~(pi-pi/6<=ang && ang<=pi+pi/6)
            m(j,i)=1;
        elseif -14<=xm(1,i) && xm(1,i)<-9 && -2.8<=ym(j,1) && ym(j,1)<=-1.8
            m(j,i)=1;
        elseif -11<=xm(1,i) && xm(1,i)<-9 && 1.8<=ym(j,1) && ym(j,1)<=2.8
            m(j,i)=1;
        elseif -14<=xm(1,i) && xm(1,i)<-13 && -2.8<=ym(j,1) && ym(j,1)<=14
            m(j,i)=1;
        elseif -11<=xm(1,i) && xm(1,i)<-10 && 2.8<=ym(j,1) && ym(j,1)<=11
            m(j,i)=1;
        elseif -14<=xm(1,i) && xm(1,i)<14 && 14<=ym(j,1) && ym(j,1)<=15
            m(j,i)=1;
        elseif -11<=xm(1,i) && xm(1,i)<11 && 11<=ym(j,1) && ym(j,1)<=12
            m(j,i)=1;            
        elseif 14<=xm(1,i) && xm(1,i)<15 && -15<=ym(j,1) && ym(j,1)<=15
            m(j,i)=1;
        elseif -5<=xm(1,i) && xm(1,i)<14 && -15<=ym(j,1) && ym(j,1)<=-14
            m(j,i)=1;
        elseif 10<=r && r<=16 && 0.95*pi/3.5<=ang && ang<=1.05*pi/3.5
            m(j,i)=1;            
        elseif xm(1,i)<0.98*xw || 0.98*xe<xm(1,i) || ym(j,1)<0.98*ys || 0.98*yn<ym(j,1) % Boundaries
            m(j,i)=1;
        end
    end
end
mesh(xm,ym,m);    axis image;  view(0, 90); %xlabel('x'); ylabel('y');

[the cyclist]

What's your question?

[GHADAH AL-OBAIDI]

My question is how can I write a matlab code to create 100 random particles(all the same size) distributed uniformly in an empty plot with dimensions (x-axis from -16 to 16) and (y-axis from -16 to 16) and (angle from 0 to 2*pi). I must avoid the furniture or the obstacles in my map and my map function as above.

[the cyclist]

Ah, ok. I didn't understand that your code only creates the map.

You need to avoid the yellow area, or the purple/blue area?

[GHADAH AL-OBAIDI]

I need to avoid the yellow area

[GHADAH AL-OBAIDI]

Any update please

[Paul Hoffrichter]

Duplicate questions (as of 2021-04-27):

https://www.mathworks.com/matlabcentral/answers/806792-index-in-position-1-is-invalid-array-indices-must-be-positive-integers-or-logical-values?s_tid=prof_contriblnk

https://www.mathworks.com/matlabcentral/answers/805766-index-in-position-1-is-invalid-array-indices-must-be-positive-integers-or-logical-values?s_tid=prof_contriblnk

https://www.mathworks.com/matlabcentral/answers/813670-create-100-random-particles-all-the-same-size-in-an-empty-plot-with-dimensions-x-axis-from-16-to?s_tid=srchtitle

https://www.mathworks.com/matlabcentral/answers/809330-index-in-position-1-exceeds-array-bounds-must-not-exceed-641-error-in-measurements-line-117?s_tid=prof_contriblnk

[GHADAH AL-OBAIDI]

They are not duplicate questions. I am working on project which has many parts and each question from differnet part. And no one helped me till now.

[Rik]

There are two methods:

1. generate random points and reject those that are in an invalid position
2. design a procedure that guarantees you will not get any points that are invalid

Which one did you try?

[GHADAH AL-OBAIDI]

the first one

[Rik]

What issues are you having in implementing that? Do you have issues generating random numbers? Or detecting if the points are invalid?

[Walter Roberson]

And no one helped me till now.

Then Paul and I are "no one" ???

https://www.mathworks.com/matlabcentral/answers/806792-index-in-position-1-is-invalid-array-indices-must-be-positive-integers-or-logical-values#answer_681415