[SYSTEMDS-1816] toString can return -0

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: SystemML 0.15
• Component/s: Runtime
• Assignee: Nakul Jindal
• Reporter: Jon Deron Eriksson
• Created: 28/Jul/17 20:31
• Updated: 09/Sep/17 04:57
• Resolved: 09/Aug/17 05:11

Description

When display matrix values with toString, -0 can be displayed.

Example:

m = matrix("50 99 100 200",rows=2,cols=2);
x = 100;
m = (m - x) * ((m-x) >= 0)
print(toString(m))

gives:

-0.000 -0.000
0.000 100.000

Using as.scalar on the individual cells returns 0:

for (i in 1:nrow(m)) {
    for (j in 1:ncol(m)) {
        n = m[i,j]
        print('[' + i + ',' + j + ']:' + as.scalar(n))
    }
}

gives:

[1,1]:0.0
[1,2]:0.0
[2,1]:0.0
[2,2]:100.0