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why matlab always show my equation as matrix dimension

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Hao Ming Low
Hao Ming Low 2020-3-24
回答： Stephen23 2020-3-24
i have tried to input the equation
y = (668.061/x)*[-39-e^(-0.1468*x)]
, but it always says that
Error using ^ (line 51)
Incorrect dimensions for raising a matrix to a power. Check that the matrix is square and the power is a
scalar. To perform elementwise matrix powers, use '.^'.

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回答（2 个）

Birdman
Birdman 2020-3-24
Try this:
y = (668.061./x)*[-39-exp(-0.1468*x)]
Stephen23
Stephen23 2020-3-24
Most likely you need to follow the advice given in the error message and use array operations, e.g.:
y = (668.061./x).*(-39-exp(-0.1468*x))
"why matlab always show my equation as matrix dimension"
Because you used the wrong operators:
https://www.mathworks.com/help/matlab/matlab_prog/array-vs-matrix-operations.html

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