how to write code for this equation?

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ajeet verma 2017-8-4

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回答： Star Strider 2017-8-4

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equation is here R(x)=1-0.4[cos(x/100)], 0<=x<=511 i am trying like this clc; clear all; s = @(x) (1-0.4*(cos(x/100))).*(0<=x & x<=511); x = linspace(0, 20); R = s(x); figure(1),plot(R,x) but i am not getting desired graph as given for particular equation

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Answer 1

Star Strider 2017-8-4

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在 MATLAB Online 中打开

You need ‘x’ to be longer, and you need to reverse the arguments to your plot call. (The axis call is not absolutely necessary.)

Try this:

s = @(x) (1-0.4*(cos(x/100))).*(0<=x & x<=511);
x = linspace(0, 500);
R = s(x);
figure(1)
plot(x,R)
axis([xlim    0  1.5])

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Answer 2

John D'Errico 2017-8-4

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编辑：John D'Errico 2017-8-4

Um, you got exactly what you plotted? My crystal ball is so cloudy today, that I cannot read your mind.

What did you want to see?

Did you want to see a curve that went over the domain for x of [0,511]? If so, is there a good reason why you generated x that only goes from 0 to 20? Should MATLAB read your mind that what you told it to do is not what you wanted to see?

Is there a reason why you plotted x versus y, thus y on the x axis, and x on the y axis? Again, how can I or MATLAB know that you told it to do something that may or may not be what you wanted?

When you get something strange, look carefully at what you did. Think about what you told the computer to do. Don't expect that it will read your mind. Instead, all it will read are the lines you typed.