XorSum opened a new pull request #1058:
URL: https://github.com/apache/systemds/pull/1058
Let't look at this demo:
```
h = matrix(1.0,rows = 3,cols=3)
a = matrix(2.0,rows = 3,cols=3)
s = matrix(3.0,rows = 3,cols=1)
s2 = s %*% t(s)
print("s="+toString(s2))
h2 = h %*% h %*% s2 %*% a %*% a
print("h="+toString(h2))
```
the output is correct
```
s=9.000 9.000 9.000
9.000 9.000 9.000
9.000 9.000 9.000
h=2916.000 2916.000 2916.000
2916.000 2916.000 2916.000
2916.000 2916.000 2916.000
```
however, if we comment the fifth line
```
h = matrix(1.0,rows = 3,cols=3)
a = matrix(2.0,rows = 3,cols=3)
s = matrix(3.0,rows = 3,cols=1)
s2 = s %*% t(s)
#print("s="+toString(s2))
h2 = h %*% h %*% s2 %*% a %*% a
print("h="+toString(h2))
```
then a bug occured
```
An Error Occured :
HopsException -- ERROR: ./demo.dml line 6, column 32 --
Hops::optimizeMMChain() : Matrix Dimension Mismatch: 1 != 3
```
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