Digits not displayed in result of simple computation

Question

Matlab:

>> format long g
>> A=29357.71
A =
              29357.71

>> B=7623.52
B =
                   7623.52
>> A+B
ans =
                  36981.23

I got what I entered. I entered .71 in first input and Matlab doesn't ignore human orders (second law of robotics).

Mathematica:

A = 29357.71
29357.7
B = 7623.52
7623.52
A + B
36981.2

In first line it violates second order of robotics: human has entered .71, but Mathmatica think it doesn't matter by it's own reasons.

Is it possible to force Mathematica behave like normal calculator or like Matlab with command format long g?

Using suffix is either insufficient:

A = 29357.71`7
29357.71
B = 7623.52
7623.52
A + B
36981.2

or redundant

A = 29357.71`7
29357.71
B = 7623.52`7
7623.520
A + B
36981.23

Mathematica shows only a limited number of digits, but the other digits are there. — Henrik Schumacher, Feb 05 '22 at 14:15

score 7 · Answer 1 · answered Feb 05 '22 at 11:27

7

To get close to Matlab's format long g you can try adding at top of your notebook

 $PrePrint = If[NumericQ[#], NumberForm[#, 15]] &;

Now

Mathematica graphics

answered Feb 05 '22 at 11:27

Nasser

score 1 · Answer 2 · answered Feb 05 '22 at 10:52

1

It worked the following way

A = 29357.71``3
29357.71
B = 7623.52``3
7623.52
A + B
36981.23

althoug I don't understand why should I enter 3 but not 2.

answered Feb 05 '22 at 10:52

Dims

That's probably not what you want. "Precision[29357.713]"returns `7.46772` which means less than eight digits of precision, while"Precision[29357.71`]"`` returns MachinePrecision which is double precision (the precision used by Matlab). – Henrik Schumacher Feb 05 '22 at 14:17

2 Answers2