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Warn me when the equation number is pushed to the next line

aligning a multiline formula with the bullet of itemizeLeft aligning equations without align characterAn embarrassing Multline errorAdjusting the width of a displaymath environmentList of equations, including equation contents and captionHow to Position the Equation Number in begin{equation} environment for a parametric equation ( i.e. x = { a or b )How continue a equation next lineVertically center equation number in aligned equationAlign equations within one linemapsto and function definition / definition environment

6

Is it possible to let amsmath warn me when the equation is too long and pushes the number to the next line?

I expect either it prints Equation (1) too long to console or it makes the (1) part red.

documentclass[twocolumn]{article}



usepackage{amsmath}



begin{document}



    begin{equation}

        A+B+C+D+R+F+G+H+I+J+L+M+N+O+P

    end{equation}



end{document}

equations amsmath

share|improve this question

edited 1 hour ago

Symbol 1

asked 2 hours ago

Symbol 1Symbol 1

25.5k240122

add a comment | 

6

Is it possible to let amsmath warn me when the equation is too long and pushes the number to the next line?

I expect either it prints Equation (1) too long to console or it makes the (1) part red.

documentclass[twocolumn]{article}



usepackage{amsmath}



begin{document}



    begin{equation}

        A+B+C+D+R+F+G+H+I+J+L+M+N+O+P

    end{equation}



end{document}

equations amsmath

share|improve this question

edited 1 hour ago

Symbol 1

asked 2 hours ago

Symbol 1Symbol 1

25.5k240122

add a comment | 

Is it possible to let amsmath warn me when the equation is too long and pushes the number to the next line?

I expect either it prints Equation (1) too long to console or it makes the (1) part red.

documentclass[twocolumn]{article}



usepackage{amsmath}



begin{document}



    begin{equation}

        A+B+C+D+R+F+G+H+I+J+L+M+N+O+P

    end{equation}



end{document}

equations amsmath

share|improve this question

edited 1 hour ago

Symbol 1

asked 2 hours ago

Symbol 1Symbol 1

25.5k240122

documentclass[twocolumn]{article}



usepackage{amsmath}



begin{document}



    begin{equation}

        A+B+C+D+R+F+G+H+I+J+L+M+N+O+P

    end{equation}



end{document}

share|improve this question

edited 1 hour ago

Symbol 1

asked 2 hours ago

Symbol 1Symbol 1

25.5k240122

share|improve this question

edited 1 hour ago

Symbol 1

asked 2 hours ago

Symbol 1Symbol 1

25.5k240122

asked 2 hours ago

Symbol 1Symbol 1

25.5k240122

asked 2 hours ago

Symbol 1Symbol 1

25.5k240122

1 Answer
1

active

oldest

votes

3

I don't want to say it is impossible but it's definitely a hard problem, because amsmath relies on the eqno primitive to do this work for the equation environment.

hsize=8cm

$$A+B+C+D+R+F+G+H+I+J+L+M+N+O+Peqno(1)$$

bye

So the only way I see is to override the eqno primitive and measure the penalties to see whether the number will be flushed to the next line.

---

For the align family of environments it is a little easier because tag shifting is handled by macros, which you simply hook your custom error or warning into

documentclass[twocolumn]{article}



usepackage{amsmath}



makeatletter

defplace@tag{%

    iftagsleft@

        kern-tagshift@

        if1shift@tagrow@relax

            errmessage{Equation too wide}%

            rlap{vbox{%

                normalbaselines

                boxz@

                vbox tolineht@{}%

                raise@tag

            }}%

        else

            rlap{boxz@}%

        fi

        kerndisplaywidth@

    else

        kern-tagshift@

        if1shift@tagrow@relax

            errmessage{Equation too wide}%

            llap{vtop{%

                raise@tag

                normalbaselines

                setbox@nenull

                dp@nelineht@

                box@ne

                boxz@

            }}%

        else

            llap{boxz@}%

        fi

    fi

}

makeatother





begin{document}



    begin{align}

        A+B+C+D+R+F+G+H+I+J+L+M+N+O+P

    end{align}



end{document}

share|improve this answer

edited 57 mins ago

answered 1 hour ago

Henri MenkeHenri Menke

76.3k8167282

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Can we assume align gives the same result as equation does and throw things into align and test it? Or, test the height of vbox with and without eqno?
  
  – Symbol 1
  49 mins ago
  
  
  

  
  
  
  

add a comment | 

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3

I don't want to say it is impossible but it's definitely a hard problem, because amsmath relies on the eqno primitive to do this work for the equation environment.

hsize=8cm

$$A+B+C+D+R+F+G+H+I+J+L+M+N+O+Peqno(1)$$

bye

So the only way I see is to override the eqno primitive and measure the penalties to see whether the number will be flushed to the next line.

---

For the align family of environments it is a little easier because tag shifting is handled by macros, which you simply hook your custom error or warning into

documentclass[twocolumn]{article}



usepackage{amsmath}



makeatletter

defplace@tag{%

    iftagsleft@

        kern-tagshift@

        if1shift@tagrow@relax

            errmessage{Equation too wide}%

            rlap{vbox{%

                normalbaselines

                boxz@

                vbox tolineht@{}%

                raise@tag

            }}%

        else

            rlap{boxz@}%

        fi

        kerndisplaywidth@

    else

        kern-tagshift@

        if1shift@tagrow@relax

            errmessage{Equation too wide}%

            llap{vtop{%

                raise@tag

                normalbaselines

                setbox@nenull

                dp@nelineht@

                box@ne

                boxz@

            }}%

        else

            llap{boxz@}%

        fi

    fi

}

makeatother





begin{document}



    begin{align}

        A+B+C+D+R+F+G+H+I+J+L+M+N+O+P

    end{align}



end{document}

share|improve this answer

edited 57 mins ago

answered 1 hour ago

Henri MenkeHenri Menke

76.3k8167282

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Can we assume align gives the same result as equation does and throw things into align and test it? Or, test the height of vbox with and without eqno?
  
  – Symbol 1
  49 mins ago
  
  
  

  
  
  
  

add a comment | 

3

I don't want to say it is impossible but it's definitely a hard problem, because amsmath relies on the eqno primitive to do this work for the equation environment.

hsize=8cm

$$A+B+C+D+R+F+G+H+I+J+L+M+N+O+Peqno(1)$$

bye

So the only way I see is to override the eqno primitive and measure the penalties to see whether the number will be flushed to the next line.

---

For the align family of environments it is a little easier because tag shifting is handled by macros, which you simply hook your custom error or warning into

documentclass[twocolumn]{article}



usepackage{amsmath}



makeatletter

defplace@tag{%

    iftagsleft@

        kern-tagshift@

        if1shift@tagrow@relax

            errmessage{Equation too wide}%

            rlap{vbox{%

                normalbaselines

                boxz@

                vbox tolineht@{}%

                raise@tag

            }}%

        else

            rlap{boxz@}%

        fi

        kerndisplaywidth@

    else

        kern-tagshift@

        if1shift@tagrow@relax

            errmessage{Equation too wide}%

            llap{vtop{%

                raise@tag

                normalbaselines

                setbox@nenull

                dp@nelineht@

                box@ne

                boxz@

            }}%

        else

            llap{boxz@}%

        fi

    fi

}

makeatother





begin{document}



    begin{align}

        A+B+C+D+R+F+G+H+I+J+L+M+N+O+P

    end{align}



end{document}

share|improve this answer

edited 57 mins ago

answered 1 hour ago

Henri MenkeHenri Menke

76.3k8167282

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Can we assume align gives the same result as equation does and throw things into align and test it? Or, test the height of vbox with and without eqno?
  
  – Symbol 1
  49 mins ago
  
  
  

  
  
  
  

add a comment | 

I don't want to say it is impossible but it's definitely a hard problem, because amsmath relies on the eqno primitive to do this work for the equation environment.

hsize=8cm

$$A+B+C+D+R+F+G+H+I+J+L+M+N+O+Peqno(1)$$

bye

So the only way I see is to override the eqno primitive and measure the penalties to see whether the number will be flushed to the next line.

---

For the align family of environments it is a little easier because tag shifting is handled by macros, which you simply hook your custom error or warning into

documentclass[twocolumn]{article}



usepackage{amsmath}



makeatletter

defplace@tag{%

    iftagsleft@

        kern-tagshift@

        if1shift@tagrow@relax

            errmessage{Equation too wide}%

            rlap{vbox{%

                normalbaselines

                boxz@

                vbox tolineht@{}%

                raise@tag

            }}%

        else

            rlap{boxz@}%

        fi

        kerndisplaywidth@

    else

        kern-tagshift@

        if1shift@tagrow@relax

            errmessage{Equation too wide}%

            llap{vtop{%

                raise@tag

                normalbaselines

                setbox@nenull

                dp@nelineht@

                box@ne

                boxz@

            }}%

        else

            llap{boxz@}%

        fi

    fi

}

makeatother





begin{document}



    begin{align}

        A+B+C+D+R+F+G+H+I+J+L+M+N+O+P

    end{align}



end{document}

share|improve this answer

edited 57 mins ago

answered 1 hour ago

Henri MenkeHenri Menke

76.3k8167282

hsize=8cm

$$A+B+C+D+R+F+G+H+I+J+L+M+N+O+Peqno(1)$$

bye

documentclass[twocolumn]{article}



usepackage{amsmath}



makeatletter

defplace@tag{%

    iftagsleft@

        kern-tagshift@

        if1shift@tagrow@relax

            errmessage{Equation too wide}%

            rlap{vbox{%

                normalbaselines

                boxz@

                vbox tolineht@{}%

                raise@tag

            }}%

        else

            rlap{boxz@}%

        fi

        kerndisplaywidth@

    else

        kern-tagshift@

        if1shift@tagrow@relax

            errmessage{Equation too wide}%

            llap{vtop{%

                raise@tag

                normalbaselines

                setbox@nenull

                dp@nelineht@

                box@ne

                boxz@

            }}%

        else

            llap{boxz@}%

        fi

    fi

}

makeatother





begin{document}



    begin{align}

        A+B+C+D+R+F+G+H+I+J+L+M+N+O+P

    end{align}



end{document}

share|improve this answer

edited 57 mins ago

answered 1 hour ago

Henri MenkeHenri Menke

76.3k8167282

answered 1 hour ago

Henri MenkeHenri Menke

76.3k8167282

answered 1 hour ago

Henri MenkeHenri Menke

76.3k8167282