plot within a for loop and if statment

Question

Kole 2014-11-10

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https://ww2.mathworks.cn/matlabcentral/answers/162029-plot-within-a-for-loop-and-if-statment

评论： Kole 2014-11-10

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

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Answer 1

Image Analyst 2014-11-10

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/162029-plot-within-a-for-loop-and-if-statment#answer_158348

在 MATLAB Online 中打开

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]);

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Kole 2014-11-10

在 MATLAB Online 中打开

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 2014-11-10

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)

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