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

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

[Cris LaPierre]

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.

Answer 1

[Steven Lord]

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