Matrix multiplication by it's transpose returning zeros matrix?

矩阵乘法，矩阵转置返回零？

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This paper introduces the basic idea and algorithm of sparse Matrix multiplication by using incompact storage method.

介绍了对稀疏矩阵进行压缩存储时，稀疏矩阵相乘运算的基本思想和算法。

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The paper applies the method of spectral analysis of multiplication by waveband to caculatedensity value in theory and discusses the future of the method of printing color measurement in2000.

采用逐波相乘的光谱分析法，对密度值进行了理论计算。 根据目前国际密度计与色度计的生产状况，探讨了2000年图象印刷色彩测量方法的发展趋势。

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You might recall from grade school sometimes you put things in parentheses so that your addition happens first, then your multiplication, otherwise multiplication would happen by default first.

你们可能会想起小学时，将一些加法表达式,放在圆括号里，这样加法可以先计算，然后是乘法，否则，乘法默认先发生。

哈佛公开课 - 计算机科学课程节选

And so, in fact, if I wanted the other version of it, in fact, if I do this right, 23 it's going to give me 23 because it does the multiplication first, if I wanted the other version of it, Python I need to tell it that, by using, excuse me, parentheses.

因此，实际上，如果我想换种做法，实际上，如果我去执行这个表达式，返回值是3,因为乘法会被优先执行，如果我需要换种做法，我需要告诉，用括号来告诉它。

麻省理工公开课 - 计算机科学及编程导论课程节选

n It takes discrete values, multiples of some integer n, and the multiplication factor is the ratio of the Planck constant divided by 2 pi where n takes one, two, three and so on.

这些离散的值乘以整数，乘积因子,是普朗克常数除以2π,其中n可以取1，2，3，等等。

麻省理工公开课 - 固态化学导论课程节选

"If this means they're going to cooperate even more, it's almost like a multiplication of the threat posed by each, " said Bruce Riedel, a counterterrorism expert at the Brookings Institution.

WSJ: Al Qaeda Declares Stake in Syrian Rebellion

The draft primary curriculum for maths, due to be introduced in schools next year, contains plans for pupils to memorise their times tables up to 12 by age nine, multiply and divide fractions by age 11, as well as learn topics such as geometry, long division and multiplication and decimals.

BBC: Primary maths plan threatens 'too much too soon'