How to debug this type of error ??

d_p = 0.8; 

d_b = 3.9;

c_b = 4.39; 

l = 10.6;  

n_t=6;     

n_z=1;  

nt = 400;  

nz = 300; 

i_c = 1.2; 

x_1 = l-d_p-(d_b/2)-c_b; 

x_2 = x_1-l;  

xs=linspace(0,2*pi*r/n_t,nt/n_t);

y=linspace(x_2,x_1,nz/n_z);

[XS,Y]=meshgrid(xs,y);

I_1 = XS.^2 + Y.^2 - (i_c/2)^2;

I_2 =(XS-(pi*r/(n_t/2))).^2 + (Y).^2 - (i_c/2)^2; 

F = I_1 <0 | I_2<0;

FF=repmat (F,n_z,n_t); 

[nz,ntn]=size(FF);

x = linspace(0,2*pi*r,ntn);

[X,Y]=meshgrid(x,y); 

mesh(x,y,FF)

ERROR:

Error using matlab.graphics.chart.primitive.Surface/set
While setting the 'ZData' property of 'Surface':
Value must be a scalar, vector or array of numeric type

Error in matlab.graphics.chart.internal.ctorHelper (line 6)
      set(obj, pvpairs{:});

Error in matlab.graphics.chart.primitive.Surface

Error in mesh (line 133)
        hh =
        matlab.graphics.chart.primitive.Surface('XData',x,'YData',y,'ZData',z,...

Error in Untitled (line 23)
mesh(x,y,FF)

Answer 1

[Walter Roberson]

Your FF is type logical not numeric. You can double(FF)

But I have to wonder... Your FF is already an array and then you repmat in both horizontal and vertical direction. The reason for that is not obvious.

[Manas Ranjan Pattnayak]

My F is the initial matrix. Then FF is the repmat of 'F' in both direction.

FF,X,Y are my final matrixes which I want to plot.

[Manas Ranjan Pattnayak]

When I used FF= double(FF), i got the solution. Could you please explain the reason.

Thank You so much.

[Walter Roberson]

F is logical, and when you repmat() logical you get something that is logical, so FF is logical. surf() does not accept logical.

F is logical because it is the result of the logical operations < and |