plot within a for loop and if statment

i have this data of wells, where in the first column i need to sort out all the 1's in that coulmn and plot the x,y,z corresponding to that row where the 1 is. this is the code i have

b=sum(a==1);
 hold on
for n=1:221
  if a(n)==1
      ;
      plot3(xTop(n),yTop(n),1:b:0'k-')
      n=n+1;

    end
  end

the coulmn is 221 rows long and i have the vaiables for the x and y shown but the z needs to go from 1 to 0 and i cant get the legth right or something?? if this is confusing ask me more questions thank you

Answer 1

[Image Analyst]

No for loop is needed.

% Find rows of "a" with 1's in the first column of "a".
rowsWith1s = a(:,1) == 1;
% Now extract them from the other arrays.
% (optional - you could do this inside plot3() if you want).
x = xTop(rowsWith1s);
y = yTop(rowsWith1s);
z = zTop(rowsWith1s);
% Now plot
plot3(x, y, z, 'bo-', 'LineWidth', 3);
% Make it fancy.
grid on;
xlabel('xTop', 'FontSize', 25);
ylabel('yTop', 'FontSize', 25);
% Enlarge figure to full screen.
set(gcf, 'Units', 'Normalized', 'OuterPosition', [0 0 1 1]);

[Kole]

how do i get the z the be the same length, in small increments from 1:0

[Image Analyst]

I don't know what you mean. You gave us no information whatsoever on xTop, yTop, a, or z, so I'm hoping you can either figure it out yourself, or give us more info. I'll check tomorrow.

[Kole]

This is What i have now but still wont work

   b=sum(a==1)
  Nodev=(a(:,1)==1);
  plot3(xTop(Nodev),yTop(Nodev),1:b:0,'k-')

doesnt need to fancy or anything but i just need the vectors to be the same length

[Kole]

xTopand yTop are my x and y values and a is the first column with the ones and twos in it. but then i need my z values to go from 1 to 0. so the vector must be the same length as xTop(Nodev)