如图，怎么进行解码？

代码供参考

function strOut =  decode(str)
i = 0;
while (i<length(str))
    i=i+1;
    str(i)
    if(str(i)<'0' || str(i)>'9')
        continue;
    end
    j = str(i-1);
    jp = i-1;
    count = 0;
    num = 0;
    while(i<=length(str) && str(i)>='0' && str(i)<='9')
        count = count + 1;
        num = (str2double(str(i))) + 10*num;
        i = i + 1;
    end
    repstr = repmat(j, [1,num]);
    str = [str(1:jp-1), repstr, str(jp+count+1:end)];
    i = i + num-count-1;
end
strOut = str;
end

示例：

decode('g2l4og4')

结果：

ans =

    'ggllllogggg'