How to save space when writing equations with cases?












1















I am writing in IEEE double column environment. I have some equations with cases. For example, this equation seems to have too much space after the brace and also before and after the commas.



enter image description here



I was using the array environment which seems to cause those large spacing. I still prefer to have some independent control over the alignment of the three parts of the equation, since in some cases for each column, the length may be quite different, and I may choose to center, left, or right align for each column. What would be a good way to make those spacings smaller but still have control over the alignment?



The code I used for the equation is 



begin{equation}

theta_{pk}=left{ begin{array}{ccc}

omega t+alpha+beta & , & n=1,2,3,4,5,6,ldots\

-omega t-alpha-beta & , & n=7,8,9,10,11,12,ldots

end{array}right.

end{equation}





math-mode spacing







share|improve this question


















  • 5





    There exists an environment for that: cases.

    – marmot
    7 hours ago
















1















I am writing in IEEE double column environment. I have some equations with cases. For example, this equation seems to have too much space after the brace and also before and after the commas.



enter image description here



I was using the array environment which seems to cause those large spacing. I still prefer to have some independent control over the alignment of the three parts of the equation, since in some cases for each column, the length may be quite different, and I may choose to center, left, or right align for each column. What would be a good way to make those spacings smaller but still have control over the alignment?



The code I used for the equation is 



begin{equation}

theta_{pk}=left{ begin{array}{ccc}

omega t+alpha+beta & , & n=1,2,3,4,5,6,ldots\

-omega t-alpha-beta & , & n=7,8,9,10,11,12,ldots

end{array}right.

end{equation}





math-mode spacing







share|improve this question


















  • 5





    There exists an environment for that: cases.

    – marmot
    7 hours ago














1












1








1








I am writing in IEEE double column environment. I have some equations with cases. For example, this equation seems to have too much space after the brace and also before and after the commas.



enter image description here



I was using the array environment which seems to cause those large spacing. I still prefer to have some independent control over the alignment of the three parts of the equation, since in some cases for each column, the length may be quite different, and I may choose to center, left, or right align for each column. What would be a good way to make those spacings smaller but still have control over the alignment?



The code I used for the equation is 



begin{equation}

theta_{pk}=left{ begin{array}{ccc}

omega t+alpha+beta & , & n=1,2,3,4,5,6,ldots\

-omega t-alpha-beta & , & n=7,8,9,10,11,12,ldots

end{array}right.

end{equation}





math-mode spacing







share|improve this question














I am writing in IEEE double column environment. I have some equations with cases. For example, this equation seems to have too much space after the brace and also before and after the commas.



enter image description here



I was using the array environment which seems to cause those large spacing. I still prefer to have some independent control over the alignment of the three parts of the equation, since in some cases for each column, the length may be quite different, and I may choose to center, left, or right align for each column. What would be a good way to make those spacings smaller but still have control over the alignment?



The code I used for the equation is 



begin{equation}

theta_{pk}=left{ begin{array}{ccc}

omega t+alpha+beta & , & n=1,2,3,4,5,6,ldots\

-omega t-alpha-beta & , & n=7,8,9,10,11,12,ldots

end{array}right.

end{equation}





math-mode spacing




math-mode spacing






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked 7 hours ago









nanjunnanjun

14016




14016








  • 5





    There exists an environment for that: cases.

    – marmot
    7 hours ago














  • 5





    There exists an environment for that: cases.

    – marmot
    7 hours ago








5




5





There exists an environment for that: cases.

– marmot
7 hours ago





There exists an environment for that: cases.

– marmot
7 hours ago










2 Answers
2






active

oldest

votes


















4














as mentioned @marmot in comment, cases from amsmath is right toool for what you like obtain:



enter image description here



documentclass{IEEEtran}

usepackage{amsmath}



usepackage{lipsum}  % for dummy text



begin{document}

lipsum[1]

begin{equation}

theta_{pk} =

    begin{cases}

omega t+alpha+beta   & , n=1,2,3,4,5,6,ldots\

-omega t-alpha-beta  & , n=7,8,9,10,11,12,ldots

    end{cases}

end{equation}

lipsum[2-4]

end{document}





share|improve this answer
























  • Is it possible to reduce the space before the commas if I have slightly longer equations to fit in the column?

    – nanjun
    6 hours ago






  • 1





    Great answer!! According to AMS, I think that the commas have to start just after the expression e.g. omega t+alpha+beta, and not omega t+alpha+beta&,, and at the end of the line should be a comma e.g. ldots,.

    – manooooh
    6 hours ago











  • @manooooh -- "According to AMS ... have to" is a bit of a stretch. The traditional location of the commas is indeed at the end of the initial segment of a line, not after the &. That is what is shown in the user guide (texdoc amsldoc).

    – barbara beeton
    42 mins ago



















1














A variant, with the fleqn environment from nccmath. I improvedged the alignment in the first column of the cases environment, using a phantom — sign in the first row.



You also can save some space – to a certain extent, with the mathrlap command from mathtools (which loads amsmath). I didn't need it here.



documentclass{IEEEtran}

usepackage{amsmath, nccmath}



usepackage{lipsum} % for dummy text



begin{document}



lipsum[1]

begin{fleqn}

begin{equation}

theta_{pk} =

    begin{cases}

phantom{-}omega t+alpha+beta, & n=1,2,3,4,5,6,ldots\

-omega t-alpha-beta, & n=7,8,9,10,11,12,ldots

    end{cases}

end{equation}

end{fleqn}

lipsum[2-4]



end{document}


enter image description here






share|improve this answer
























  • What's the purpose of fleqn? I see no reason for it.

    – egreg
    6 hours ago











  • @egreg: Inside this environment, the equations are flushleft, while being aligned, gathered, &c. This can save some space.

    – Bernard
    5 hours ago














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2 Answers
2






active

oldest

votes








2 Answers
2






active

oldest

votes









active

oldest

votes






active

oldest

votes









4














as mentioned @marmot in comment, cases from amsmath is right toool for what you like obtain:



enter image description here



documentclass{IEEEtran}

usepackage{amsmath}



usepackage{lipsum}  % for dummy text



begin{document}

lipsum[1]

begin{equation}

theta_{pk} =

    begin{cases}

omega t+alpha+beta   & , n=1,2,3,4,5,6,ldots\

-omega t-alpha-beta  & , n=7,8,9,10,11,12,ldots

    end{cases}

end{equation}

lipsum[2-4]

end{document}





share|improve this answer
























  • Is it possible to reduce the space before the commas if I have slightly longer equations to fit in the column?

    – nanjun
    6 hours ago






  • 1





    Great answer!! According to AMS, I think that the commas have to start just after the expression e.g. omega t+alpha+beta, and not omega t+alpha+beta&,, and at the end of the line should be a comma e.g. ldots,.

    – manooooh
    6 hours ago











  • @manooooh -- "According to AMS ... have to" is a bit of a stretch. The traditional location of the commas is indeed at the end of the initial segment of a line, not after the &. That is what is shown in the user guide (texdoc amsldoc).

    – barbara beeton
    42 mins ago
















4














as mentioned @marmot in comment, cases from amsmath is right toool for what you like obtain:



enter image description here



documentclass{IEEEtran}

usepackage{amsmath}



usepackage{lipsum}  % for dummy text



begin{document}

lipsum[1]

begin{equation}

theta_{pk} =

    begin{cases}

omega t+alpha+beta   & , n=1,2,3,4,5,6,ldots\

-omega t-alpha-beta  & , n=7,8,9,10,11,12,ldots

    end{cases}

end{equation}

lipsum[2-4]

end{document}





share|improve this answer
























  • Is it possible to reduce the space before the commas if I have slightly longer equations to fit in the column?

    – nanjun
    6 hours ago






  • 1





    Great answer!! According to AMS, I think that the commas have to start just after the expression e.g. omega t+alpha+beta, and not omega t+alpha+beta&,, and at the end of the line should be a comma e.g. ldots,.

    – manooooh
    6 hours ago











  • @manooooh -- "According to AMS ... have to" is a bit of a stretch. The traditional location of the commas is indeed at the end of the initial segment of a line, not after the &. That is what is shown in the user guide (texdoc amsldoc).

    – barbara beeton
    42 mins ago














4












4








4







as mentioned @marmot in comment, cases from amsmath is right toool for what you like obtain:



enter image description here



documentclass{IEEEtran}

usepackage{amsmath}



usepackage{lipsum}  % for dummy text



begin{document}

lipsum[1]

begin{equation}

theta_{pk} =

    begin{cases}

omega t+alpha+beta   & , n=1,2,3,4,5,6,ldots\

-omega t-alpha-beta  & , n=7,8,9,10,11,12,ldots

    end{cases}

end{equation}

lipsum[2-4]

end{document}





share|improve this answer













as mentioned @marmot in comment, cases from amsmath is right toool for what you like obtain:



enter image description here



documentclass{IEEEtran}

usepackage{amsmath}



usepackage{lipsum}  % for dummy text



begin{document}

lipsum[1]

begin{equation}

theta_{pk} =

    begin{cases}

omega t+alpha+beta   & , n=1,2,3,4,5,6,ldots\

-omega t-alpha-beta  & , n=7,8,9,10,11,12,ldots

    end{cases}

end{equation}

lipsum[2-4]

end{document}






share|improve this answer












share|improve this answer



share|improve this answer










answered 6 hours ago









ZarkoZarko

130k869169




130k869169













  • Is it possible to reduce the space before the commas if I have slightly longer equations to fit in the column?

    – nanjun
    6 hours ago






  • 1





    Great answer!! According to AMS, I think that the commas have to start just after the expression e.g. omega t+alpha+beta, and not omega t+alpha+beta&,, and at the end of the line should be a comma e.g. ldots,.

    – manooooh
    6 hours ago











  • @manooooh -- "According to AMS ... have to" is a bit of a stretch. The traditional location of the commas is indeed at the end of the initial segment of a line, not after the &. That is what is shown in the user guide (texdoc amsldoc).

    – barbara beeton
    42 mins ago



















  • Is it possible to reduce the space before the commas if I have slightly longer equations to fit in the column?

    – nanjun
    6 hours ago






  • 1





    Great answer!! According to AMS, I think that the commas have to start just after the expression e.g. omega t+alpha+beta, and not omega t+alpha+beta&,, and at the end of the line should be a comma e.g. ldots,.

    – manooooh
    6 hours ago











  • @manooooh -- "According to AMS ... have to" is a bit of a stretch. The traditional location of the commas is indeed at the end of the initial segment of a line, not after the &. That is what is shown in the user guide (texdoc amsldoc).

    – barbara beeton
    42 mins ago

















Is it possible to reduce the space before the commas if I have slightly longer equations to fit in the column?

– nanjun
6 hours ago





Is it possible to reduce the space before the commas if I have slightly longer equations to fit in the column?

– nanjun
6 hours ago




1




1





Great answer!! According to AMS, I think that the commas have to start just after the expression e.g. omega t+alpha+beta, and not omega t+alpha+beta&,, and at the end of the line should be a comma e.g. ldots,.

– manooooh
6 hours ago





Great answer!! According to AMS, I think that the commas have to start just after the expression e.g. omega t+alpha+beta, and not omega t+alpha+beta&,, and at the end of the line should be a comma e.g. ldots,.

– manooooh
6 hours ago













@manooooh -- "According to AMS ... have to" is a bit of a stretch. The traditional location of the commas is indeed at the end of the initial segment of a line, not after the &. That is what is shown in the user guide (texdoc amsldoc).

– barbara beeton
42 mins ago





@manooooh -- "According to AMS ... have to" is a bit of a stretch. The traditional location of the commas is indeed at the end of the initial segment of a line, not after the &. That is what is shown in the user guide (texdoc amsldoc).

– barbara beeton
42 mins ago











1














A variant, with the fleqn environment from nccmath. I improvedged the alignment in the first column of the cases environment, using a phantom — sign in the first row.



You also can save some space – to a certain extent, with the mathrlap command from mathtools (which loads amsmath). I didn't need it here.



documentclass{IEEEtran}

usepackage{amsmath, nccmath}



usepackage{lipsum} % for dummy text



begin{document}



lipsum[1]

begin{fleqn}

begin{equation}

theta_{pk} =

    begin{cases}

phantom{-}omega t+alpha+beta, & n=1,2,3,4,5,6,ldots\

-omega t-alpha-beta, & n=7,8,9,10,11,12,ldots

    end{cases}

end{equation}

end{fleqn}

lipsum[2-4]



end{document}


enter image description here






share|improve this answer
























  • What's the purpose of fleqn? I see no reason for it.

    – egreg
    6 hours ago











  • @egreg: Inside this environment, the equations are flushleft, while being aligned, gathered, &c. This can save some space.

    – Bernard
    5 hours ago


















1














A variant, with the fleqn environment from nccmath. I improvedged the alignment in the first column of the cases environment, using a phantom — sign in the first row.



You also can save some space – to a certain extent, with the mathrlap command from mathtools (which loads amsmath). I didn't need it here.



documentclass{IEEEtran}

usepackage{amsmath, nccmath}



usepackage{lipsum} % for dummy text



begin{document}



lipsum[1]

begin{fleqn}

begin{equation}

theta_{pk} =

    begin{cases}

phantom{-}omega t+alpha+beta, & n=1,2,3,4,5,6,ldots\

-omega t-alpha-beta, & n=7,8,9,10,11,12,ldots

    end{cases}

end{equation}

end{fleqn}

lipsum[2-4]



end{document}


enter image description here






share|improve this answer
























  • What's the purpose of fleqn? I see no reason for it.

    – egreg
    6 hours ago











  • @egreg: Inside this environment, the equations are flushleft, while being aligned, gathered, &c. This can save some space.

    – Bernard
    5 hours ago
















1












1








1







A variant, with the fleqn environment from nccmath. I improvedged the alignment in the first column of the cases environment, using a phantom — sign in the first row.



You also can save some space – to a certain extent, with the mathrlap command from mathtools (which loads amsmath). I didn't need it here.



documentclass{IEEEtran}

usepackage{amsmath, nccmath}



usepackage{lipsum} % for dummy text



begin{document}



lipsum[1]

begin{fleqn}

begin{equation}

theta_{pk} =

    begin{cases}

phantom{-}omega t+alpha+beta, & n=1,2,3,4,5,6,ldots\

-omega t-alpha-beta, & n=7,8,9,10,11,12,ldots

    end{cases}

end{equation}

end{fleqn}

lipsum[2-4]



end{document}


enter image description here






share|improve this answer













A variant, with the fleqn environment from nccmath. I improvedged the alignment in the first column of the cases environment, using a phantom — sign in the first row.



You also can save some space – to a certain extent, with the mathrlap command from mathtools (which loads amsmath). I didn't need it here.



documentclass{IEEEtran}

usepackage{amsmath, nccmath}



usepackage{lipsum} % for dummy text



begin{document}



lipsum[1]

begin{fleqn}

begin{equation}

theta_{pk} =

    begin{cases}

phantom{-}omega t+alpha+beta, & n=1,2,3,4,5,6,ldots\

-omega t-alpha-beta, & n=7,8,9,10,11,12,ldots

    end{cases}

end{equation}

end{fleqn}

lipsum[2-4]



end{document}


enter image description here







share|improve this answer












share|improve this answer



share|improve this answer










answered 6 hours ago









BernardBernard

176k778210




176k778210













  • What's the purpose of fleqn? I see no reason for it.

    – egreg
    6 hours ago











  • @egreg: Inside this environment, the equations are flushleft, while being aligned, gathered, &c. This can save some space.

    – Bernard
    5 hours ago





















  • What's the purpose of fleqn? I see no reason for it.

    – egreg
    6 hours ago











  • @egreg: Inside this environment, the equations are flushleft, while being aligned, gathered, &c. This can save some space.

    – Bernard
    5 hours ago



















What's the purpose of fleqn? I see no reason for it.

– egreg
6 hours ago





What's the purpose of fleqn? I see no reason for it.

– egreg
6 hours ago













@egreg: Inside this environment, the equations are flushleft, while being aligned, gathered, &c. This can save some space.

– Bernard
5 hours ago







@egreg: Inside this environment, the equations are flushleft, while being aligned, gathered, &c. This can save some space.

– Bernard
5 hours ago




















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