Do you want to round your data to 6 decimal places or do you want to only display 6 decimal places?
Rounding data
There should be a good motivation to round your data since rounding reduces precision.
If the table T only contains numeric values, to round to 6 decimal places,
T = table(randi(9,6,1),rand(6,1),rand(6,1))
T =
Var1 Var2 Var3
____ _________________ _________________
2 0.725338116901227 0.994765943138584
9 0.320618926475707 0.284367465241924
6 0.335310975596281 0.276336750461116
2 0.943554905674576 0.882825699220907
8 0.916217169287025 0.208771672709224
8 0.859710202417857 0.302971404253732
T = round(T,6)
T =
Var1 Var2 Var3
____ ________ ________
2 0.725338 0.994766
9 0.320619 0.284367
6 0.335311 0.276337
2 0.943555 0.882826
8 0.916217 0.208772
8 0.85971 0.302971
If there are non-numeric values, you must index the numeric columns,
T = table(randi(9,6,1),rand(6,1),rand(6,1),["A";"B";"C";"D";"E";"F"])
T =
Var1 Var2 Var3 Var4
____ __________________ __________________ ____
9 0.140640344325377 0.545690896520992 "A"
6 0.534564780303479 0.255537880321794 "B"
3 0.608246493062309 0.437895392704874 "C"
2 0.282577029861513 0.103822166775036 "D"
6 0.0932949799876582 0.0783210469773984 "E"
6 0.950524707254477 0.208341593890096 "F"
isnum = varfun(@isnumeric,T,'OutputFormat','uniform');
T(:,isnum) = round(T(:,isnum),6)
T =
Var1 Var2 Var3 Var4
____ ________ ________ ____
9 0.14064 0.545691 "A"
6 0.534565 0.255538 "B"
3 0.608246 0.437895 "C"
2 0.282577 0.103822 "D"
6 0.093295 0.078321 "E"
6 0.950525 0.208342 "F"
Limiting the display
One way to limit the display of all numeric values is to use the DisplayFormatOptions function (R2021a and later) or to set the format(style). However, options are limited to a predefined list of formats and numeric values that have fewer decimal places will not be padded. MATLAB does not show trailing 0s. This willl change the display of all numeric values in the command window. The only way to show a specific number of decimal places with padded 0s is to convert the numeric values to strings (or characters or categoricals). This makes the numeric values more difficult to work with in MATLAB since they are no longer numbers. The for-loops @Cameron shared in the other answer is one way to achieve this. This method below only acts on columns of numeric data. T = table(randi(9,6,1),rand(6,1),rand(6,1),["A";"B";"C";"D";"E";"F"])
T =
Var1 Var2 Var3 Var4
____ __________________ _________________ ____
8 0.756369931514242 0.884371198607867 "A"
3 0.0165155749564821 0.854212032598753 "B"
4 0.492091252123063 0.914375079398313 "C"
2 0.176764358391581 0.893269657248392 "D"
4 0.783188938813622 0.947915493887413 "E"
4 0.791837657976275 0.633317996462687 "F"
isnum = varfun(@isnumeric,T,'OutputFormat','uniform');
T = convertvars(T,isnum,'string');
T(:,isnum) = arrayfun(@(n) {sprintf('%.6f',n)},T{:,isnum})
T =
Var1 Var2 Var3 Var4
__________ __________ __________ ____
"8.000000" "0.756370" "0.884370" "A"
"3.000000" "0.016516" "0.854210" "B"
"4.000000" "0.492090" "0.914380" "C"
"2.000000" "0.176760" "0.893270" "D"
"4.000000" "0.783190" "0.947920" "E"
"4.000000" "0.791840" "0.633320" "F"
