How i can convert a number in table to 6-digit decimal?

Based on the table above,how to convert numbers in table to 6 digit decimal, thank you for your attention and solution

Answer 1

[Cameron]

Do you mean 6 total digits or 6 digits after the decimal? For 6 total digits, you can do this:

T = ([1:10;pi:pi:10*pi])';
MyArray = strings(size(T));
for row = 1:size(T,1)
    for col = 1:size(T,2)
        MyArray(row,col) = regexprep(sprintf('%#.7g',T(row,col)),'.$','');
    end
end
disp(MyArray)

    "1.00000"    "3.14159"
    "2.00000"    "6.28318"
    "3.00000"    "9.42477"
    "4.00000"    "12.5663"
    "5.00000"    "15.7079"
    "6.00000"    "18.8495"
    "7.00000"    "21.9911"
    "8.00000"    "25.1327"
    "9.00000"    "28.2743"
    "10.0000"    "31.4159"

For 6 digits after the decimal, you can do this:

T = ([1:10;pi:pi:10*pi])';
MyArray = strings(size(T));
for row = 1:size(T,1)
    for col = 1:size(T,2)
        MyArray(row,col) = sprintf('%.6f',T(row,col));
    end
end
disp(MyArray)

    "1.000000"     "3.141593" 
    "2.000000"     "6.283185" 
    "3.000000"     "9.424778" 
    "4.000000"     "12.566371"
    "5.000000"     "15.707963"
    "6.000000"     "18.849556"
    "7.000000"     "21.991149"
    "8.000000"     "25.132741"
    "9.000000"     "28.274334"
    "10.000000"    "31.415927"

[Troy Yoga]

thank you for your solution sir

Answer 2

[Adam Danz]

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,

format long % for demo purposes; use "format default" to revert to default
T = table(randi(9,6,1),rand(6,1),rand(6,1))

T = 6×3 table
    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 = 6×3 table
    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 = 6×4 table
    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 = 6×4 table
    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 = 6×4 table
    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'); % R2018b or later
T(:,isnum) = arrayfun(@(n) {sprintf('%.6f',n)},T{:,isnum})

T = 6×4 table
       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"