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Math Forum » Discussions » Software » comp.soft-sys.matlab

Topic: Computation precision on command line and in scripts
Replies: 8   Last Post: Feb 11, 2013 6:59 AM

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Bruno Luong

Posts: 8,465
Registered: 7/26/08
Re: Computation precision on command line and in scripts
Posted: Feb 7, 2013 4:12 PM
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"Bruno Luong" <b.luong@fogale.findmycountry> wrote in message >
> The documentation states that
>
> 1) an arithmetic expression is mixed with two numerical type, the result is cast in lower type, then the operation is carried out.
>
> 2) The expression is evaluated from left to right
>

It seems that this rule does not applied for scalar expression affected with colon operator on the lhs. To avoid JIT, I put the argument as parameters of foo function.

function [a rd rs] = foo(b, c, d)

a = zeros(1,2,'double');
bar = b + c -d;
a(1) = b + c -d;
a(2) = bar;

rd = 0;
rd(:) = b + c -d;

rs = single(0);
rs(:) = b + c -d;

end % foo

% and here is the result

>> [a rd rs] = foo(single(1),1e-9,1)

a =

0 0


rd =

1.0000e-09


rs =

1.0000e-09

>>



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