How do i multiply this matrix to work in MATLAB, it keeps sending an error

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Carine
Carine 2024-9-26
评论： Cris LaPierre 2024-9-26

(3^.5)*sind(x)*(p.)+cosd(x)*(p.)-800

  1 个评论
Cris LaPierre
Cris LaPierre 2024-9-26
Ran in:
What are the values of your variables x and p?
What is the full error message (all the red text)?
You should probably remove the dot after p. as that may be causing your error.
p = 5;
p.
Invalid expression. Check for missing or extra characters.

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回答（1 个）

Steven Lord
Steven Lord 2024-9-26
Ran in:
What did you expect to happen when you typed p. in your expression? That's not valid MATLAB syntax. If you had a number instead of p, that would have been valid because that period would be interpreted as a decimal point.
x = 0:30.:180; % same as 0:30:180 or 0:30.0:180
y1 = (3^.5)*sind(x)*(2.)+cosd(x)*(2.)-800 % number, trailing decimal point, works
y1 = 1×7
-798.0000 -796.5359 -796.0000 -796.5359 -798.0000 -800.0000 -802.0000
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p = 2;
y2 = (3^.5)*sind(x)*(p)+cosd(x)*(p)-800 % variable name, no period, works
y2 = 1×7
-798.0000 -796.5359 -796.0000 -796.5359 -798.0000 -800.0000 -802.0000
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% y3 = (3^.5)*sind(x)*(p.)+cosd(x)*(p.)-800 % variable name, period, would not work

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