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I am writing in IEEEtran double-column environment and have a table like the following. I need to increase the row height so the equations in the second column can fit in. I tried simply to use renewcommandarraystretch2.5 where every thing can fit in but the vertical alignment is not very good. For example, the first row are not aligned and it seems that each cell is not perfectly vertically middle aligned if you look closely. They are very slightly a little higher or a little lower. My question is, besides increasing the row height, how do I make each cell perfectly middle align in the vertical direction?

The tables shown below are of arraystretch 1 and 2.5, respectively.

The codes for producing the tables are

begintable 
captionarraystretch = 1

renewcommandarraystretch1
centering%
begintabularccc
toprule 
multirow1*No. & Equations & Current phasorstabularnewline
midrule
multirow2*1 & multirow2*$begincases
i_A=1\
i_B=2\
i_C=3
endcases$ & 1, 2, 3tabularnewline
cmidrule3-3 
 & & 4, 5, 6tabularnewline
midrule
multirow2*2 & multirow2*$begincases
i_A=4\
i_B=5\
i_C=6
endcases$ & 1, 2, 3tabularnewline
cmidrule3-3 
 & & 4, 5, 6tabularnewline
bottomrule
endtabular
endtable

begintable
captionarraystretch = 2.5

renewcommandarraystretch2.5
centering%
begintabularccc
toprule 
multirow1*No. & Equations & Current phasorstabularnewline
midrule
multirow2*1 & multirow2*$begincases
i_A=1\
i_B=2\
i_C=3
endcases$ & 1, 2, 3tabularnewline
cmidrule3-3 
 & & 4, 5, 6tabularnewline
midrule
multirow2*2 & multirow2*$begincases
i_A=4\
i_B=5\
i_C=6
endcases$ & 1, 2, 3tabularnewline
cmidrule3-3 
 & & 4, 5, 6tabularnewline
bottomrule
endtabular
endtable 

The structure of your table is sufficiently unusual to warrant typesetting the contents of each cell as a separate custom, vertically centered tabular environment in its own right.

In the following example, I define two such custom tabular-like environments:

• mytabC, if the width of the tabular is supposed to equal the natural width of the cell's contents, and




• mytabP, if the width of the tabular is supposed to be a fixed length -- say, the width of the contents of the corresponding header cell.

In the following screenshot, the upper row employs mytabC for columns 1 and 2, and mytabP for the third column. The lower row employs mytabC for all 3 columns. I provide both types of solutions as it's not clear to me whether the midrule is supposed to span the full width of the cell or if its width is supposed to be the natural width of the cell's contents.

documentclassIEEEtran
usepackagebooktabs,amsmath,array,ragged2e
%% Some housekeeping:
newlengthmylen
newcolumntypeP[1]>Centeringarraybackslashp#1
%% Macros to generate two custom 'tabular' environments:
newcommandmytabC[1]%
 begintabular[c]@ c @ #1 endtabular
newcommandmytabP[2]settowidthmylen#1%
 begintabular[c]@ Pmylen @ #2 endtabular

begindocument 
begintable 
captionarraystretch = 1
centering

begintabular@ccc@
toprule 
No. & Equations & Current phasors\
midrule
mytabC1 & 
mytabC$begincases i_A=1\i_B=2\i_C=3 endcases$ & 
mytabPCurrent phasors1, 2, 3\ midrule 4, 5, 6\
midrule
mytabC2 & 
mytabC$begincases i_D=4\i_E=5\i_F=6 endcases$ & 
mytabC7, 8, 9\ midrule 0, 1, 2\
bottomrule
endtabular
endtable
enddocument