dection of a word inside a condition (if)

Question

Josep 2014-10-30

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/160734-dection-of-a-word-inside-a-condition-if

评论： Image Analyst 2014-10-30

I have programmed a code and I would like Matlab to recognise the word of materials (steel and aluminium). Any idea?

Following I put the code:

function y=kfgraf(r,Sut,material)
      a=xlsread('kf.xls'); %Extret del webplotdigitizer
      x1=a(1:67,1);
      y1=a(1:67,2);
      x2=a(1:65,3);
      y2=a(1:65,4);
      x3=a(1:64,5);
      y3=a(1:64,6);
      x4=a(1:63,7);
      y4=a(1:63,8);
      x5=a(1:59,9);
      y5=a(1:59,10);
      if material==steel && Sut<=0.4
          i1=interp1(x1,y1,r,'spline');
          y=i1
      end
      if material==steel && Sut>0.4 && Sut<=0.7
          i1=interp1(x1,y1,r,'spline');
          i2=interp1(x2,y2,r,'spline');
          prop=((Sut-0.4)/(0.7-0.4))
          y=i1+prop.*(i2-i1);
      end
      if material==steel && Sut>0.7 && Sut<=1
          i1=interp1(x2,y2,r,'spline');
          i2=interp1(x3,y3,r,'spline');
          prop=((Sut-0.7)/(1-0.7))
          y=i1+prop.*(i2-i1);
      end
      if material==steel && Sut>1 && Sut<=1.4
          i1=interp1(x3,y3,r,'spline');
          i2=interp1(x4,y4,r,'spline');
          prop=((Sut-1)/(1.4-1))
          y=i1+prop.*(i2-i1);
      end
      if material==steel && Sut>=1.4
          i1=interp1(x4,y4,r,'spline');
          y=i1
      end
      if material==aluminium
          i1=interp1(x5,y5,r,'spline');
          y=i1
      end
  end

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Answer 1

per isakson 2014-10-30

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/160734-dection-of-a-word-inside-a-condition-if#answer_157171

编辑：per isakson 2014-10-30

在 MATLAB Online 中打开

First idea:

    >> material = 'steel';
    >> strcmp( material, 'steel' )
    ans =
         1

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Josep 2014-10-30

编辑：per isakson 2014-10-30

在 MATLAB Online 中打开

I am doing this and I have an error message:

function y=kfgraf(r,Sut,material)
material='steel';
strcmp( material,'steel')
a=xlsread('kf.xls'); %Extret del webplotdigitizer
x1=a(1:67,1);
y1=a(1:67,2);
x2=a(1:65,3);
y2=a(1:65,4);
x3=a(1:64,5);
y3=a(1:64,6);
x4=a(1:63,7);
y4=a(1:63,8);
x5=a(1:59,9);
y5=a(1:59,10);
if strcmp( material,'steel') && Sut<=0.4 
      i1=interp1(x1,y1,r,'spline');
      y=i1;
  end
if strcmp( material,'steel') && Sut>0.4 && Sut<=0.7
      i1=interp1(x1,y1,r,'spline');
      i2=interp1(x2,y2,r,'spline');
      prop=((Sut-0.4)/(0.7-0.4));
      y=i1+prop.*(i2-i1);
end
if strcmp( material,'steel') && Sut>0.7 && Sut<=1
      i1=interp1(x2,y2,r,'spline');
      i2=interp1(x3,y3,r,'spline');
      prop=((Sut-0.7)/(1-0.7));
      y=i1+prop.*(i2-i1);
end
if strcmp( material,'steel') && Sut>1 && Sut<=1.4
      i1=interp1(x3,y3,r,'spline');
      i2=interp1(x4,y4,r,'spline');
      prop=((Sut-1)/(1.4-1));
      y=i1+prop.*(i2-i1);
end
if strcmp( material,'steel') && Sut>=1.4
      i1=interp1(x4,y4,r,'spline');
      y=i1
end
end

Josep 2014-10-30

Image Analyst 2014-10-30

在 MATLAB Online 中打开

How are you calling this function? It requires input arguments so you can't just click the green triangle to run it. What the warning (not error) is saying is that you accept material via the input argument list but you don't use it because you overwrite it immediately with the line

material='steel';

so whatever you pass in is ignored completely, so you might as well not bother having it or passing it in.

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