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What is the domain in a tikz parametric plot?


LaTeX equivalent of ConTeXt buffersHow can I put a coloured outline around fraction lines?How to define the default vertical distance between nodes?Numerical conditional within tikz keys?TikZ: Drawing an arc from an intersection to an intersectionHow to prevent rounded and duplicated tick labels in pgfplots with fixed precision?Drawing rectilinear curves in Tikz, aka an Etch-a-Sketch drawingLine up nested tikz enviroments or how to get rid of themHow to draw a square and its diagonals with arrows?Get tikz domain and range













2















I don't understand what's going on here. If the domain of the parametric parameter t is 0:100, then the function sin(2pi*t) should oscillate about 100 times, but it only oscillates a couple. What am I missing?



documentclassarticle
usepackagetikz
begindocument
begintikzpicture
beginscope[x=.6textwidth,y=.6textwidth]
draw[very thin,color=gray, step=.1] (0.0,0.0) grid (1,1);
draw [ thick, domain=0:100, samples=40, smooth, variable=t]
plot (t/100, sin(2*pi*t)*.5+.5);
endscope
endtikzpicture
enddocument


enter image description here










share|improve this question


























    2















    I don't understand what's going on here. If the domain of the parametric parameter t is 0:100, then the function sin(2pi*t) should oscillate about 100 times, but it only oscillates a couple. What am I missing?



    documentclassarticle
    usepackagetikz
    begindocument
    begintikzpicture
    beginscope[x=.6textwidth,y=.6textwidth]
    draw[very thin,color=gray, step=.1] (0.0,0.0) grid (1,1);
    draw [ thick, domain=0:100, samples=40, smooth, variable=t]
    plot (t/100, sin(2*pi*t)*.5+.5);
    endscope
    endtikzpicture
    enddocument


    enter image description here










    share|improve this question
























      2












      2








      2








      I don't understand what's going on here. If the domain of the parametric parameter t is 0:100, then the function sin(2pi*t) should oscillate about 100 times, but it only oscillates a couple. What am I missing?



      documentclassarticle
      usepackagetikz
      begindocument
      begintikzpicture
      beginscope[x=.6textwidth,y=.6textwidth]
      draw[very thin,color=gray, step=.1] (0.0,0.0) grid (1,1);
      draw [ thick, domain=0:100, samples=40, smooth, variable=t]
      plot (t/100, sin(2*pi*t)*.5+.5);
      endscope
      endtikzpicture
      enddocument


      enter image description here










      share|improve this question














      I don't understand what's going on here. If the domain of the parametric parameter t is 0:100, then the function sin(2pi*t) should oscillate about 100 times, but it only oscillates a couple. What am I missing?



      documentclassarticle
      usepackagetikz
      begindocument
      begintikzpicture
      beginscope[x=.6textwidth,y=.6textwidth]
      draw[very thin,color=gray, step=.1] (0.0,0.0) grid (1,1);
      draw [ thick, domain=0:100, samples=40, smooth, variable=t]
      plot (t/100, sin(2*pi*t)*.5+.5);
      endscope
      endtikzpicture
      enddocument


      enter image description here







      tikz-pgf plot domain






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked 4 hours ago









      argentum2fargentum2f

      1336




      1336




















          1 Answer
          1






          active

          oldest

          votes


















          4














          You got the domain right. The problem is that the trigonometric functions in TikZ are (oddly, in my opinion) in degrees by default. So 2*pi*t with t between 0 and 100 will give you the sine function (in degrees) between 0 and 628.3 degrees (which is about 10.96 radians) which almost 1.75 periods of the function. This is exactly what you see there: one full period and 3/4 of another.



          You can tell TikZ to use radians by appending an r to the argument or using the rad function (see page 1005 of the TikZ-PGF manual, section 93.3.4 “Trigonometric functions”). I also added the FPU to allow the domain up to 100 and increased the number of samples to 400 following Kpym's suggestion (notice the aliasing):




          enter image description here




          documentclassarticle
          usepackagetikz
          usetikzlibraryfpu
          begindocument
          begintikzpicture
          beginscope[x=.6textwidth,y=.6textwidth]
          pgfkeys/pgf/fpu=true,/pgf/fpu/output format=fixed
          draw[very thin,color=gray, step=.1] (0.0,0.0) grid (1,1);
          draw [ thick, domain=0:100, samples=400, smooth, variable=t]
          plot (t/100, sin(2*pi*t r)*.5+.5);
          endscope% ^
          endtikzpicture
          enddocument





          share|improve this answer




















          • 1





            with samples=400,smooth it looks better, but this is not the question ;)

            – Kpym
            4 hours ago











          • @Kpym Certainly! I just removed the smooth to show that 100 cycles with 40 samples won't do (unless OP wants to show the aliasing). Thanks anyway :)

            – Phelype Oleinik
            4 hours ago











          • Doh! Degrees... Yeah, don't know why that didn't occur to me. I'm just so used to thinking in radians. Usually trigonometric functions are defined assuming radians, but I guess it makes sense since everywhere else in latex assumes angles are degrees. I actually did try and turn up the samples at first - thought it was just aliasing.

            – argentum2f
            3 hours ago











          • @argentum2f Yes, as I said “oddly”. All programming languages I know (which aren't that many, but...) have a sin function for argument radians and sind function for argument in degrees. Anyhow, Till must have had his reasons :)

            – Phelype Oleinik
            3 hours ago










          Your Answer








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          1 Answer
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          1 Answer
          1






          active

          oldest

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          active

          oldest

          votes






          active

          oldest

          votes









          4














          You got the domain right. The problem is that the trigonometric functions in TikZ are (oddly, in my opinion) in degrees by default. So 2*pi*t with t between 0 and 100 will give you the sine function (in degrees) between 0 and 628.3 degrees (which is about 10.96 radians) which almost 1.75 periods of the function. This is exactly what you see there: one full period and 3/4 of another.



          You can tell TikZ to use radians by appending an r to the argument or using the rad function (see page 1005 of the TikZ-PGF manual, section 93.3.4 “Trigonometric functions”). I also added the FPU to allow the domain up to 100 and increased the number of samples to 400 following Kpym's suggestion (notice the aliasing):




          enter image description here




          documentclassarticle
          usepackagetikz
          usetikzlibraryfpu
          begindocument
          begintikzpicture
          beginscope[x=.6textwidth,y=.6textwidth]
          pgfkeys/pgf/fpu=true,/pgf/fpu/output format=fixed
          draw[very thin,color=gray, step=.1] (0.0,0.0) grid (1,1);
          draw [ thick, domain=0:100, samples=400, smooth, variable=t]
          plot (t/100, sin(2*pi*t r)*.5+.5);
          endscope% ^
          endtikzpicture
          enddocument





          share|improve this answer




















          • 1





            with samples=400,smooth it looks better, but this is not the question ;)

            – Kpym
            4 hours ago











          • @Kpym Certainly! I just removed the smooth to show that 100 cycles with 40 samples won't do (unless OP wants to show the aliasing). Thanks anyway :)

            – Phelype Oleinik
            4 hours ago











          • Doh! Degrees... Yeah, don't know why that didn't occur to me. I'm just so used to thinking in radians. Usually trigonometric functions are defined assuming radians, but I guess it makes sense since everywhere else in latex assumes angles are degrees. I actually did try and turn up the samples at first - thought it was just aliasing.

            – argentum2f
            3 hours ago











          • @argentum2f Yes, as I said “oddly”. All programming languages I know (which aren't that many, but...) have a sin function for argument radians and sind function for argument in degrees. Anyhow, Till must have had his reasons :)

            – Phelype Oleinik
            3 hours ago















          4














          You got the domain right. The problem is that the trigonometric functions in TikZ are (oddly, in my opinion) in degrees by default. So 2*pi*t with t between 0 and 100 will give you the sine function (in degrees) between 0 and 628.3 degrees (which is about 10.96 radians) which almost 1.75 periods of the function. This is exactly what you see there: one full period and 3/4 of another.



          You can tell TikZ to use radians by appending an r to the argument or using the rad function (see page 1005 of the TikZ-PGF manual, section 93.3.4 “Trigonometric functions”). I also added the FPU to allow the domain up to 100 and increased the number of samples to 400 following Kpym's suggestion (notice the aliasing):




          enter image description here




          documentclassarticle
          usepackagetikz
          usetikzlibraryfpu
          begindocument
          begintikzpicture
          beginscope[x=.6textwidth,y=.6textwidth]
          pgfkeys/pgf/fpu=true,/pgf/fpu/output format=fixed
          draw[very thin,color=gray, step=.1] (0.0,0.0) grid (1,1);
          draw [ thick, domain=0:100, samples=400, smooth, variable=t]
          plot (t/100, sin(2*pi*t r)*.5+.5);
          endscope% ^
          endtikzpicture
          enddocument





          share|improve this answer




















          • 1





            with samples=400,smooth it looks better, but this is not the question ;)

            – Kpym
            4 hours ago











          • @Kpym Certainly! I just removed the smooth to show that 100 cycles with 40 samples won't do (unless OP wants to show the aliasing). Thanks anyway :)

            – Phelype Oleinik
            4 hours ago











          • Doh! Degrees... Yeah, don't know why that didn't occur to me. I'm just so used to thinking in radians. Usually trigonometric functions are defined assuming radians, but I guess it makes sense since everywhere else in latex assumes angles are degrees. I actually did try and turn up the samples at first - thought it was just aliasing.

            – argentum2f
            3 hours ago











          • @argentum2f Yes, as I said “oddly”. All programming languages I know (which aren't that many, but...) have a sin function for argument radians and sind function for argument in degrees. Anyhow, Till must have had his reasons :)

            – Phelype Oleinik
            3 hours ago













          4












          4








          4







          You got the domain right. The problem is that the trigonometric functions in TikZ are (oddly, in my opinion) in degrees by default. So 2*pi*t with t between 0 and 100 will give you the sine function (in degrees) between 0 and 628.3 degrees (which is about 10.96 radians) which almost 1.75 periods of the function. This is exactly what you see there: one full period and 3/4 of another.



          You can tell TikZ to use radians by appending an r to the argument or using the rad function (see page 1005 of the TikZ-PGF manual, section 93.3.4 “Trigonometric functions”). I also added the FPU to allow the domain up to 100 and increased the number of samples to 400 following Kpym's suggestion (notice the aliasing):




          enter image description here




          documentclassarticle
          usepackagetikz
          usetikzlibraryfpu
          begindocument
          begintikzpicture
          beginscope[x=.6textwidth,y=.6textwidth]
          pgfkeys/pgf/fpu=true,/pgf/fpu/output format=fixed
          draw[very thin,color=gray, step=.1] (0.0,0.0) grid (1,1);
          draw [ thick, domain=0:100, samples=400, smooth, variable=t]
          plot (t/100, sin(2*pi*t r)*.5+.5);
          endscope% ^
          endtikzpicture
          enddocument





          share|improve this answer















          You got the domain right. The problem is that the trigonometric functions in TikZ are (oddly, in my opinion) in degrees by default. So 2*pi*t with t between 0 and 100 will give you the sine function (in degrees) between 0 and 628.3 degrees (which is about 10.96 radians) which almost 1.75 periods of the function. This is exactly what you see there: one full period and 3/4 of another.



          You can tell TikZ to use radians by appending an r to the argument or using the rad function (see page 1005 of the TikZ-PGF manual, section 93.3.4 “Trigonometric functions”). I also added the FPU to allow the domain up to 100 and increased the number of samples to 400 following Kpym's suggestion (notice the aliasing):




          enter image description here




          documentclassarticle
          usepackagetikz
          usetikzlibraryfpu
          begindocument
          begintikzpicture
          beginscope[x=.6textwidth,y=.6textwidth]
          pgfkeys/pgf/fpu=true,/pgf/fpu/output format=fixed
          draw[very thin,color=gray, step=.1] (0.0,0.0) grid (1,1);
          draw [ thick, domain=0:100, samples=400, smooth, variable=t]
          plot (t/100, sin(2*pi*t r)*.5+.5);
          endscope% ^
          endtikzpicture
          enddocument






          share|improve this answer














          share|improve this answer



          share|improve this answer








          edited 4 hours ago

























          answered 4 hours ago









          Phelype OleinikPhelype Oleinik

          24.2k54688




          24.2k54688







          • 1





            with samples=400,smooth it looks better, but this is not the question ;)

            – Kpym
            4 hours ago











          • @Kpym Certainly! I just removed the smooth to show that 100 cycles with 40 samples won't do (unless OP wants to show the aliasing). Thanks anyway :)

            – Phelype Oleinik
            4 hours ago











          • Doh! Degrees... Yeah, don't know why that didn't occur to me. I'm just so used to thinking in radians. Usually trigonometric functions are defined assuming radians, but I guess it makes sense since everywhere else in latex assumes angles are degrees. I actually did try and turn up the samples at first - thought it was just aliasing.

            – argentum2f
            3 hours ago











          • @argentum2f Yes, as I said “oddly”. All programming languages I know (which aren't that many, but...) have a sin function for argument radians and sind function for argument in degrees. Anyhow, Till must have had his reasons :)

            – Phelype Oleinik
            3 hours ago












          • 1





            with samples=400,smooth it looks better, but this is not the question ;)

            – Kpym
            4 hours ago











          • @Kpym Certainly! I just removed the smooth to show that 100 cycles with 40 samples won't do (unless OP wants to show the aliasing). Thanks anyway :)

            – Phelype Oleinik
            4 hours ago











          • Doh! Degrees... Yeah, don't know why that didn't occur to me. I'm just so used to thinking in radians. Usually trigonometric functions are defined assuming radians, but I guess it makes sense since everywhere else in latex assumes angles are degrees. I actually did try and turn up the samples at first - thought it was just aliasing.

            – argentum2f
            3 hours ago











          • @argentum2f Yes, as I said “oddly”. All programming languages I know (which aren't that many, but...) have a sin function for argument radians and sind function for argument in degrees. Anyhow, Till must have had his reasons :)

            – Phelype Oleinik
            3 hours ago







          1




          1





          with samples=400,smooth it looks better, but this is not the question ;)

          – Kpym
          4 hours ago





          with samples=400,smooth it looks better, but this is not the question ;)

          – Kpym
          4 hours ago













          @Kpym Certainly! I just removed the smooth to show that 100 cycles with 40 samples won't do (unless OP wants to show the aliasing). Thanks anyway :)

          – Phelype Oleinik
          4 hours ago





          @Kpym Certainly! I just removed the smooth to show that 100 cycles with 40 samples won't do (unless OP wants to show the aliasing). Thanks anyway :)

          – Phelype Oleinik
          4 hours ago













          Doh! Degrees... Yeah, don't know why that didn't occur to me. I'm just so used to thinking in radians. Usually trigonometric functions are defined assuming radians, but I guess it makes sense since everywhere else in latex assumes angles are degrees. I actually did try and turn up the samples at first - thought it was just aliasing.

          – argentum2f
          3 hours ago





          Doh! Degrees... Yeah, don't know why that didn't occur to me. I'm just so used to thinking in radians. Usually trigonometric functions are defined assuming radians, but I guess it makes sense since everywhere else in latex assumes angles are degrees. I actually did try and turn up the samples at first - thought it was just aliasing.

          – argentum2f
          3 hours ago













          @argentum2f Yes, as I said “oddly”. All programming languages I know (which aren't that many, but...) have a sin function for argument radians and sind function for argument in degrees. Anyhow, Till must have had his reasons :)

          – Phelype Oleinik
          3 hours ago





          @argentum2f Yes, as I said “oddly”. All programming languages I know (which aren't that many, but...) have a sin function for argument radians and sind function for argument in degrees. Anyhow, Till must have had his reasons :)

          – Phelype Oleinik
          3 hours ago

















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