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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.

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

asked 7 hours ago

nanjunnanjun

14016

• 
  
  
  

  
  5
  

  
  
  
  
  
  

  
  
  There exists an environment for that: cases.
  
  – marmot
  7 hours ago
  

  
  
  
  

add a comment | 

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.

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

asked 7 hours ago

nanjunnanjun

14016

• 
  
  
  

  
  5
  

  
  
  
  
  
  

  
  
  There exists an environment for that: cases.
  
  – marmot
  7 hours ago
  

  
  
  
  

add a comment | 

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.

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

asked 7 hours ago

nanjunnanjun

14016

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}

share|improve this question

asked 7 hours ago

nanjunnanjun

14016

share|improve this question

asked 7 hours ago

nanjunnanjun

14016

asked 7 hours ago

nanjunnanjun

14016

asked 7 hours ago

nanjunnanjun

14016

2 Answers
2

active

oldest

votes

4

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

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

answered 7 hours ago

ZarkoZarko

130k869169

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Is it possible to reduce the space before the commas if I have slightly longer equations to fit in the column?
  
  – nanjun
  7 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
  7 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
  1 hour ago
  

  
  
  
  

add a comment | 

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} 

share|improve this answer

answered 6 hours ago

BernardBernard

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
  6 hours ago
  
  
  

  
  
  
  

add a comment | 

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4

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

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

answered 7 hours ago

ZarkoZarko

130k869169

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Is it possible to reduce the space before the commas if I have slightly longer equations to fit in the column?
  
  – nanjun
  7 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
  7 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
  1 hour ago
  

  
  
  
  

add a comment | 

4

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

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

answered 7 hours ago

ZarkoZarko

130k869169

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Is it possible to reduce the space before the commas if I have slightly longer equations to fit in the column?
  
  – nanjun
  7 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
  7 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
  1 hour ago
  

  
  
  
  

add a comment | 

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

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

answered 7 hours ago

ZarkoZarko

130k869169

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

answered 7 hours ago

ZarkoZarko

130k869169

answered 7 hours ago

ZarkoZarko

130k869169

answered 7 hours ago

ZarkoZarko

130k869169

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} 

share|improve this answer

answered 6 hours ago

BernardBernard

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
  6 hours ago
  
  
  

  
  
  
  

add a comment | 

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} 

share|improve this answer

answered 6 hours ago

BernardBernard

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
  6 hours ago
  
  
  

  
  
  
  

add a comment | 

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} 

share|improve this answer

answered 6 hours ago

BernardBernard

176k778210

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} 

share|improve this answer

answered 6 hours ago

BernardBernard

176k778210

answered 6 hours ago

BernardBernard

176k778210

answered 6 hours ago

BernardBernard

176k778210