How to remove unit from variable?

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I want to draw an arc of a certain length in cm, so I divide by the circumference in cm and multiply 360 to get the segment in degrees. (Is there a shortcut?)

In my MWE b is the unitless number I want to get from a. 



documentclass[tikz]{standalone}

usepackage{tikz}

usetikzlibrary{calc}

begin{document}

begin{tikzpicture}



    defa{3.14cm}

    node[scale=0.5] at (-1,0) {a};



    defb{{a / (1cm*pi) *20}}

    defc{20}



    node[scale=0.5] at (-1,1) {b};



    draw[very thin] (0,0) -- (a/3,0);

    draw[very thin] (0,0.1) -- (b,0.1);

    %draw[very thin] (0,0.1) -- ({b+0.1},0.1);



    draw[red] (1:1) arc (1:1+20:1);

    draw[blue] (30:1) arc (30:{(30+c)}:1);

    %draw[green] (60:1) arc (60:{(60+b)}:1);



end{tikzpicture}

end{document}


As can be seen from the node text and the commented lines b does not behave like a unitless scalar. Removing either comment yields ERROR: Missing number, treated as zero.

How can I make b unitless?
enter image description here






tikz-pgf tikz-calc







share|improve this question























  • Do you also want to draw the radius with the circumference? Why don't you use sin(x) and cos(x) as draw [red,thick,domain=0:90] plot ({cos(x)}, {sin(x)});?

    – Sina Ahmadi
    Feb 22 at 12:41


















2















I want to draw an arc of a certain length in cm, so I divide by the circumference in cm and multiply 360 to get the segment in degrees. (Is there a shortcut?)

In my MWE b is the unitless number I want to get from a. 



documentclass[tikz]{standalone}

usepackage{tikz}

usetikzlibrary{calc}

begin{document}

begin{tikzpicture}



    defa{3.14cm}

    node[scale=0.5] at (-1,0) {a};



    defb{{a / (1cm*pi) *20}}

    defc{20}



    node[scale=0.5] at (-1,1) {b};



    draw[very thin] (0,0) -- (a/3,0);

    draw[very thin] (0,0.1) -- (b,0.1);

    %draw[very thin] (0,0.1) -- ({b+0.1},0.1);



    draw[red] (1:1) arc (1:1+20:1);

    draw[blue] (30:1) arc (30:{(30+c)}:1);

    %draw[green] (60:1) arc (60:{(60+b)}:1);



end{tikzpicture}

end{document}


As can be seen from the node text and the commented lines b does not behave like a unitless scalar. Removing either comment yields ERROR: Missing number, treated as zero.

How can I make b unitless?
enter image description here






tikz-pgf tikz-calc







share|improve this question























  • Do you also want to draw the radius with the circumference? Why don't you use sin(x) and cos(x) as draw [red,thick,domain=0:90] plot ({cos(x)}, {sin(x)});?

    – Sina Ahmadi
    Feb 22 at 12:41
















2












2








2








I want to draw an arc of a certain length in cm, so I divide by the circumference in cm and multiply 360 to get the segment in degrees. (Is there a shortcut?)

In my MWE b is the unitless number I want to get from a. 



documentclass[tikz]{standalone}

usepackage{tikz}

usetikzlibrary{calc}

begin{document}

begin{tikzpicture}



    defa{3.14cm}

    node[scale=0.5] at (-1,0) {a};



    defb{{a / (1cm*pi) *20}}

    defc{20}



    node[scale=0.5] at (-1,1) {b};



    draw[very thin] (0,0) -- (a/3,0);

    draw[very thin] (0,0.1) -- (b,0.1);

    %draw[very thin] (0,0.1) -- ({b+0.1},0.1);



    draw[red] (1:1) arc (1:1+20:1);

    draw[blue] (30:1) arc (30:{(30+c)}:1);

    %draw[green] (60:1) arc (60:{(60+b)}:1);



end{tikzpicture}

end{document}


As can be seen from the node text and the commented lines b does not behave like a unitless scalar. Removing either comment yields ERROR: Missing number, treated as zero.

How can I make b unitless?
enter image description here






tikz-pgf tikz-calc







share|improve this question














I want to draw an arc of a certain length in cm, so I divide by the circumference in cm and multiply 360 to get the segment in degrees. (Is there a shortcut?)

In my MWE b is the unitless number I want to get from a. 



documentclass[tikz]{standalone}

usepackage{tikz}

usetikzlibrary{calc}

begin{document}

begin{tikzpicture}



    defa{3.14cm}

    node[scale=0.5] at (-1,0) {a};



    defb{{a / (1cm*pi) *20}}

    defc{20}



    node[scale=0.5] at (-1,1) {b};



    draw[very thin] (0,0) -- (a/3,0);

    draw[very thin] (0,0.1) -- (b,0.1);

    %draw[very thin] (0,0.1) -- ({b+0.1},0.1);



    draw[red] (1:1) arc (1:1+20:1);

    draw[blue] (30:1) arc (30:{(30+c)}:1);

    %draw[green] (60:1) arc (60:{(60+b)}:1);



end{tikzpicture}

end{document}


As can be seen from the node text and the commented lines b does not behave like a unitless scalar. Removing either comment yields ERROR: Missing number, treated as zero.

How can I make b unitless?
enter image description here






tikz-pgf tikz-calc




tikz-pgf tikz-calc






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Feb 22 at 12:29









user2740user2740

31419




31419













  • Do you also want to draw the radius with the circumference? Why don't you use sin(x) and cos(x) as draw [red,thick,domain=0:90] plot ({cos(x)}, {sin(x)});?

    – Sina Ahmadi
    Feb 22 at 12:41





















  • Do you also want to draw the radius with the circumference? Why don't you use sin(x) and cos(x) as draw [red,thick,domain=0:90] plot ({cos(x)}, {sin(x)});?

    – Sina Ahmadi
    Feb 22 at 12:41



















Do you also want to draw the radius with the circumference? Why don't you use sin(x) and cos(x) as draw [red,thick,domain=0:90] plot ({cos(x)}, {sin(x)});?

– Sina Ahmadi
Feb 22 at 12:41







Do you also want to draw the radius with the circumference? Why don't you use sin(x) and cos(x) as draw [red,thick,domain=0:90] plot ({cos(x)}, {sin(x)});?

– Sina Ahmadi
Feb 22 at 12:41












1 Answer
1






active

oldest

votes


















2














pgfmathsetmacro removes units. (I replaced 20 by 2 because the plot was huge when using 20.)



documentclass[tikz]{standalone}

usepackage{tikz}

usetikzlibrary{calc}

begin{document}

begin{tikzpicture}



    defa{3.14cm}

    node[scale=0.5] at (-1,0) {a};



    pgfmathsetmacrob{{a / (1cm*pi) *2}}

    defc{20}



    node[scale=0.5] at (-1,1) {b};



    draw[very thin] (0,0) -- (a/3,0);

    draw[very thin] (0,0.1) -- (b,0.1);

    draw[very thin] (0,0.1) -- (b+0.1,0.1);



    draw[red] (1:1) arc (1:1+20:1);

    draw[blue] (30:1) arc (30:{(30+c)}:1);

    draw[green] (60:1) arc (60:{(60+b)}:1);



end{tikzpicture}

end{document}


enter image description here






share|improve this answer























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    1 Answer
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    1 Answer
    1






    active

    oldest

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    active

    oldest

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    active

    oldest

    votes









    2














    pgfmathsetmacro removes units. (I replaced 20 by 2 because the plot was huge when using 20.)



    documentclass[tikz]{standalone}
    
usepackage{tikz}
    
usetikzlibrary{calc}
    
begin{document}
    
begin{tikzpicture}
    

    
    defa{3.14cm}
    
    node[scale=0.5] at (-1,0) {a};
    

    
    pgfmathsetmacrob{{a / (1cm*pi) *2}}
    
    defc{20}
    

    
    node[scale=0.5] at (-1,1) {b};
    

    
    draw[very thin] (0,0) -- (a/3,0);
    
    draw[very thin] (0,0.1) -- (b,0.1);
    
    draw[very thin] (0,0.1) -- (b+0.1,0.1);
    

    
    draw[red] (1:1) arc (1:1+20:1);
    
    draw[blue] (30:1) arc (30:{(30+c)}:1);
    
    draw[green] (60:1) arc (60:{(60+b)}:1);
    

    
end{tikzpicture}
    
end{document}


    enter image description here






    share|improve this answer




























      2














      pgfmathsetmacro removes units. (I replaced 20 by 2 because the plot was huge when using 20.)



      documentclass[tikz]{standalone}
      
usepackage{tikz}
      
usetikzlibrary{calc}
      
begin{document}
      
begin{tikzpicture}
      

      
    defa{3.14cm}
      
    node[scale=0.5] at (-1,0) {a};
      

      
    pgfmathsetmacrob{{a / (1cm*pi) *2}}
      
    defc{20}
      

      
    node[scale=0.5] at (-1,1) {b};
      

      
    draw[very thin] (0,0) -- (a/3,0);
      
    draw[very thin] (0,0.1) -- (b,0.1);
      
    draw[very thin] (0,0.1) -- (b+0.1,0.1);
      

      
    draw[red] (1:1) arc (1:1+20:1);
      
    draw[blue] (30:1) arc (30:{(30+c)}:1);
      
    draw[green] (60:1) arc (60:{(60+b)}:1);
      

      
end{tikzpicture}
      
end{document}


      enter image description here






      share|improve this answer


























        2












        2








        2







        pgfmathsetmacro removes units. (I replaced 20 by 2 because the plot was huge when using 20.)



        documentclass[tikz]{standalone}
        
usepackage{tikz}
        
usetikzlibrary{calc}
        
begin{document}
        
begin{tikzpicture}
        

        
    defa{3.14cm}
        
    node[scale=0.5] at (-1,0) {a};
        

        
    pgfmathsetmacrob{{a / (1cm*pi) *2}}
        
    defc{20}
        

        
    node[scale=0.5] at (-1,1) {b};
        

        
    draw[very thin] (0,0) -- (a/3,0);
        
    draw[very thin] (0,0.1) -- (b,0.1);
        
    draw[very thin] (0,0.1) -- (b+0.1,0.1);
        

        
    draw[red] (1:1) arc (1:1+20:1);
        
    draw[blue] (30:1) arc (30:{(30+c)}:1);
        
    draw[green] (60:1) arc (60:{(60+b)}:1);
        

        
end{tikzpicture}
        
end{document}


        enter image description here






        share|improve this answer













        pgfmathsetmacro removes units. (I replaced 20 by 2 because the plot was huge when using 20.)



        documentclass[tikz]{standalone}
        
usepackage{tikz}
        
usetikzlibrary{calc}
        
begin{document}
        
begin{tikzpicture}
        

        
    defa{3.14cm}
        
    node[scale=0.5] at (-1,0) {a};
        

        
    pgfmathsetmacrob{{a / (1cm*pi) *2}}
        
    defc{20}
        

        
    node[scale=0.5] at (-1,1) {b};
        

        
    draw[very thin] (0,0) -- (a/3,0);
        
    draw[very thin] (0,0.1) -- (b,0.1);
        
    draw[very thin] (0,0.1) -- (b+0.1,0.1);
        

        
    draw[red] (1:1) arc (1:1+20:1);
        
    draw[blue] (30:1) arc (30:{(30+c)}:1);
        
    draw[green] (60:1) arc (60:{(60+b)}:1);
        

        
end{tikzpicture}
        
end{document}


        enter image description here







        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered Feb 22 at 15:15









        marmotmarmot

        105k4124236




        105k4124236






























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