How can I display numbers in scientific notation but in magnitudes of 3 and to 3 significant digits?

I am trying to display rounded values <double> in a uitable and would like do so concisely. Using scientific notation is great for this, but I would like to have the scientific notation display only as powers divisible by 3. Additionally, the I would also like to display 3 significant digits.

For example:

1       = 1
10      = 10
100     = 100
1000    = 1.00e3
10000   = 10.0e3
100000  = 100e3
1000000 = 1.00e6

[Dyuman Joshi]

shortEng format will have the notation with exponent as a multiple of 3. (Read Here)

I am not sure about if displaying 3 significant digits is possible or not. (shortEng will have 4 digits after the decimal point)

[Walter Roberson]

I seem to recall that someone posted appropriate formatting in the File Exchange

[Allen]

Unfortunately, shortEng only displays 4 significant digits after the decimal, though is perfectly handles the exponents. Additionally, after looking into the problem a bit more, it appears that there is also no convenient method for formatting uitable numeric displays to this detail.

https://www.mathworks.com/matlabcentral/answers/339579-is-it-possible-to-control-the-precision-of-a-numeric-value-displayed-in-a-uitable-in-matlab-7-6-r20#answer_266378

Thank you both for the responses.

[John D'Errico]

sprintf SHOULD offer this as one of the options.

Answer 1

[Dongyue]

classdef ScientificNotation
    properties(Access = private)
        sign;
        body;
        digs;
        num;
    end

    methods
        function s = ScientificNotation(num)
            s.num = num;
            if num< 0 
                s.sign = '-';
            else
                s.sign = '';
            end

            num = double(abs(num));
            if num<1000
                s.body = "";
                s.digs = string(num);
            else
                tmp  = 0;
                while num >= 1000
                    tmp = tmp +3;
                    num = num/1000;
                end
                s.body = "e"+string(tmp);
                str = string(round(num,3,'significant'));
                if strlength(str) == 1
                    str = str+".00";
                elseif strlength(str) == 2
                    str = str+".0";
                elseif strlength(str) == 3
                    if contains(str,'.')
                        str = str+"0";
                    end
                end
                s.digs = str;             
            end
        end
        function disp(s)
            fprintf(string(s.num)+" = %s%s%s\n",[ s.sign, s.digs,s.body]);
        end
    end
end

[Allen]

Thank you for your response, but unfortunately I am trying to directly format doubles and not convert to text. I always like seeing new uses for classdefs.