2d plot of a function with two variables

I'm trying to represent a waveform on a transmission line given by the following formula:

y(x,t)=A*sin(phase_constant*x-2*pi*freq*t)

I need to plot the amplitude y versus distance x along the line at time (t) = 0

Do I need a for loop to do this?

[Stephen23]

"Do I need a for loop to do this?"

No, you do not need to use a loop. Use ndgrid, or repmat, or bsxfun, or whatever suits your data, and make sure that you write vectorized code:

https://www.mathworks.com/help/matlab/matlab_prog/vectorization.html

Also keep in mind the difference between array and matrix operations:

https://www.mathworks.com/help/matlab/matlab_prog/array-vs-matrix-operations.html

Answer 1

[Star Strider]

Since ‘t=0’ (or any other constant), this becomes a univariate function. You can plot it with fplot (or ezplot):

A = 42;                                                     % Substitute Correct Value
phase_constant = 2*pi*rand;                                 % Substitute Correct Value
freq = 60;                                                  % Substitute Correct Value

y = @(x,t) A*sin(phase_constant*x-2*pi*freq*t);

figure(1)
fplot(@(x) y(x,0), [0 10])
grid

See the documentation on the various functions, and on Anonymous Functions for details.

Answer 2

[Santhana Raj]

No.You need not. generate vectors of x and t. Then implement the function for y. Use mesh to plot result.

Remember to use the operator '.*' instead of * for element by element multiplication of a matrix/array/vector.