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

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}

edited 1 hour ago

asked 2 hours ago

Symbol 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}

edited 1 hour ago

asked 2 hours ago

Symbol 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}

edited 1 hour ago

asked 2 hours ago

Symbol 1

25.5k240122

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

edited 1 hour ago

asked 2 hours ago

Symbol 1

25.5k240122

edited 1 hour ago

asked 2 hours ago

Symbol 1

25.5k240122

edited 1 hour ago

asked 2 hours ago

Symbol 1

25.5k240122

asked 2 hours ago

Symbol 1

25.5k240122

asked 2 hours ago

Symbol 1

25.5k240122

add a comment |

1 Answer
1

active

oldest

votes

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

enter image description here

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}

edited 1 hour ago

answered 1 hour ago

Henri 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
57 mins ago

add a comment |

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1 Answer
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active

oldest

votes

1 Answer
1

active

oldest

votes

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

enter image description here

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}

edited 1 hour ago

answered 1 hour ago

Henri 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
57 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

enter image description here

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}

edited 1 hour ago

answered 1 hour ago

Henri 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
57 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

enter image description here

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}

edited 1 hour ago

answered 1 hour ago

Henri Menke

76.3k8167282

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

enter image description here

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}

edited 1 hour ago

answered 1 hour ago

Henri Menke

76.3k8167282

edited 1 hour ago

answered 1 hour ago

Henri Menke

76.3k8167282

answered 1 hour ago

Henri Menke

76.3k8167282

answered 1 hour ago

Henri 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
57 mins ago

add a comment |

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
57 mins ago

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
57 mins ago

add a comment |

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