Round error value to appropriate significant figures

// Function to determine significant figures
Function Sig_Fig(V_Error)
    Variable V_Error
    Variable V_Result
    print "V_Error: "+num2str(V_Error)
    String S_Error
    String S_Result
    // Calculate power of 10 of Value
    Variable V_Error_p10 = (floor(log(abs(V_Error))))
    print "V_Value_p10: "+num2str(V_Error_p10)
    Variable V_Value
    V_Value = V_Error/(10^(V_Error_p10))
    print "V_Value_SF: "+num2str(V_Value) // Convert number to the style "x.xx" 
    // Convert this to a string
    S_Error = num2str(V_Value)
    print S_Error
    // Now check whether first character in string is a 1
    String first_char = S_Error [0]
    print first_char
    if((cmpstr(first_char,"1")==0))
        // If "1", round to the next significant number:
        S_Result = first_char+S_Error [1]+S_Error [2]+S_Error [3] // "1.23"
        V_Result = (round(str2num(S_Result)*10))/10
    else
        // If other than "1", round to this significant number:
        S_Result = first_char+S_Error [1]+S_Error [2] // "2.3"
        V_Result = round(str2num(S_Result))
    endif
    // Reconstruct value by using original power of ten:
    V_Result = V_Result*(10^(V_Error_p10))
    print V_Result
    return V_Result
End