GNU Octave: fplot exponent problem











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I use GNU Octave 4.4.1 (x86_64-pc-linux-gnu on Arch Linux), and I have problem with fplot function. I would like to know why



fplot(@(x) 1/(1+25*x.^2),[-1,1])


Have a different result of



fplot(@(x) (1+25*x.^2).^-1,[-1,1])


(the latter returns the correct graphic)



Had the exact same problem with my students in a windows version of Octave 4.4.1.



I would like to know if it is an actual error or there's a fancy explanation for why the latter command is correct and the first one is wrong (so I can try to convince my students that they should use GNU Octave. OK, I'll try it anyway).






octave







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    up vote
    0
    down vote

    favorite












    I use GNU Octave 4.4.1 (x86_64-pc-linux-gnu on Arch Linux), and I have problem with fplot function. I would like to know why



    fplot(@(x) 1/(1+25*x.^2),[-1,1])


    Have a different result of



    fplot(@(x) (1+25*x.^2).^-1,[-1,1])


    (the latter returns the correct graphic)



    Had the exact same problem with my students in a windows version of Octave 4.4.1.



    I would like to know if it is an actual error or there's a fancy explanation for why the latter command is correct and the first one is wrong (so I can try to convince my students that they should use GNU Octave. OK, I'll try it anyway).






    octave







    share|improve this question









    New contributor




    Felipo Bacani is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
    Check out our Code of Conduct.






















      up vote
      0
      down vote

      favorite









      up vote
      0
      down vote

      favorite











      I use GNU Octave 4.4.1 (x86_64-pc-linux-gnu on Arch Linux), and I have problem with fplot function. I would like to know why



      fplot(@(x) 1/(1+25*x.^2),[-1,1])


      Have a different result of



      fplot(@(x) (1+25*x.^2).^-1,[-1,1])


      (the latter returns the correct graphic)



      Had the exact same problem with my students in a windows version of Octave 4.4.1.



      I would like to know if it is an actual error or there's a fancy explanation for why the latter command is correct and the first one is wrong (so I can try to convince my students that they should use GNU Octave. OK, I'll try it anyway).






      octave







      share|improve this question









      New contributor




      Felipo Bacani is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.











      I use GNU Octave 4.4.1 (x86_64-pc-linux-gnu on Arch Linux), and I have problem with fplot function. I would like to know why



      fplot(@(x) 1/(1+25*x.^2),[-1,1])


      Have a different result of



      fplot(@(x) (1+25*x.^2).^-1,[-1,1])


      (the latter returns the correct graphic)



      Had the exact same problem with my students in a windows version of Octave 4.4.1.



      I would like to know if it is an actual error or there's a fancy explanation for why the latter command is correct and the first one is wrong (so I can try to convince my students that they should use GNU Octave. OK, I'll try it anyway).






      octave




      octave






      share|improve this question









      New contributor




      Felipo Bacani is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.











      share|improve this question









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      share|improve this question




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      edited Dec 5 at 19:30









      Rui F Ribeiro

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      asked Dec 5 at 18:57









      Felipo Bacani

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