Strange outputs when using disp or fprintf

Question

Alexander Babayi 2016-10-3

0
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https://ww2.mathworks.cn/matlabcentral/answers/305453-strange-outputs-when-using-disp-or-fprintf

评论： Stephen23 2016-10-3

I currently have a code with which you input 2 numbers (x and y) and two outputs should come up (th and r). I'm having some trouble getting matlab to actually display those two outputs in the command window. Although the correct values for those outputs are listed in the workspace, my code doesn't seem to be able to reproduce those two outputs. Here is the code:

      prompt = 'Enter x value';
      x = input(prompt)
      prompt = 'Enter y value';
      y = input(prompt)
      r = sqrt(x.^2 + y.^2);
      if x>0;
          t = atan(y/x);
      elseif x<0, y>0;
          t = atan(y/x)+pi;
      elseif x<0, y<0;
          t = atan(y/x)-pi;
      elseif x<0, y==0;
          t = pi;
      elseif x==0, y>0;
          t = pi/2;
      elseif x==0, y<0;
          t = -pi/2;
      elseif x==0, y==0;
          t = 0;
      end
      th = rad2deg(t);
      fprintf('r = %s', r);
      fprintf('theta = %s degrees', th);

The "r" output value displayed in the command window, for some reason, gives me a box symbol. The "th" output value displayed in the command window gives me a "Z". I'm not sure how it is displaying these outputs, as the correct ones are in the workspace. Maybe the part of the code that is meant to print them in the command box is faulty?

Thank you.

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Steven Lord 2016-10-3

在 MATLAB Online 中打开

In addition to what Walter said, this line of code won't do what you want.

elseif x<0, y>0;

To combine multiple conditions in an if statement you need to combine them with and or or.

Alexander Babayi 2016-10-3

Thank you, I was actually just testing it and wondering why it wasn't working the way I intended. I used "&&" to combine the two conditions, if that also works. It seems to have worked.

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