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What is the equivalent of mmult of excel in matlab?

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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

Accepted Answer

Steven Lord
Steven Lord on 10 Sep 2021
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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