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What is the equivalent of mmult of excel in matlab?

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Michael Rahul Soosai
Michael Rahul Soosai 2021년 9월 10일
댓글: Michael Rahul Soosai 2021년 9월 10일
I need to multiply two uneven matrix (1 row, 4 column and 10 row, 4 column) to yield a single value. In excel i used mmult for the same

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Steven Lord
Steven Lord 2021년 9월 10일
The * operator performs matrix multiplication, but in order for that operation to be mathematically defined you need to transpose the second matrix (so the number of columns in the first matches the number of rows in the second) and you will receive a 1-by-10 matrix not a single value.
x = [1 2 3 4]
x = 1×4
1 2 3 4
y = reshape(1:40, 10, 4)
y = 10×4
1 11 21 31 2 12 22 32 3 13 23 33 4 14 24 34 5 15 25 35 6 16 26 36 7 17 27 37 8 18 28 38 9 19 29 39 10 20 30 40
z = x*y.' % transpose y
z = 1×10
210 220 230 240 250 260 270 280 290 300
To check:
z6 = 1*6 + 2*16 + 3*26 + 4*36
z6 = 260
z(6)
ans = 260
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Michael Rahul Soosai
Michael Rahul Soosai 2021년 9월 10일
Tnank you Sir very much for your time and support

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