2d plot of a function with two variables

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Vinci
Vinci 2017-5-9
回答： Star Strider 2017-5-9
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?
  1 个评论
Stephen23
Stephen23 2017-5-9
编辑：Stephen23 2017-5-9
"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

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回答（2 个）

Star Strider
Star Strider 2017-5-9
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.
Santhana Raj
Santhana Raj 2017-5-9
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.

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