creating error_msg function

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shanon 2011-10-4

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/17466-creating-error_msg-function

The issue I have is that:

You must write 4 functions. Three functions are for the area calculations: calc_circle_area, calc_rect_area, calc_triangle_are. These functions should do a calculation but NO input from the user. All user interaction must be done in the main script. The fourth function is called error_msg. Given an input string, it should display an appropriate message. For example
 >> error_msg(‘base’)
 value for base must be > 0
 no calculcation will be performed
 >> error_msg('length')
 value for length must be > 0
 no calculcation will be performed
 Hint: to concatenate two strings, enclose them in [ ]. For example,
 >> disp( ['Hello' 'world'])
 Helloworld

I have made the first three functions, I just am having problem creating the error_msg function. I don't understand how to do it, if anyone could help that would be great!

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回答（1 个）

Walter Roberson 2011-10-4

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/17466-creating-error_msg-function#answer_23543

在 MATLAB Online 中打开

function error_msg(Name)
  phrase1 = 'value for ';
  phrase2 = ' must be > 0\nno calculation will be performed\n';
  phrase = char(zeros(1,length(phrase1)+length(Name)+length(phrase2));
  for K = 1 : length(phrase1)
    phrase(K) = phrase1(K);
  end
  for K = 1 : length(Name)
    phrase(length(phrase1)+K) = Name(K);
  end
  for K = 1 : length(phrase2)
    phrase(length(phrase1)+length(phrase2)+K) = phrase2(K);
  end
  fprintf(any(phrase),phrase);
end