Plotting summation function in loop

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Jan 2017-10-28

@Yuhang Ma: Whenever you write "does not work" in a forum, add the details. It is much easier to solve a problem than to guess, what the problem is.

Yuhang Ma 2017-10-28

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Sorry, this is my first time asking question in a forum. Let finish my question. My code is as follow. I was trying to use for loop the alpha to find value g in function f and plot the graph. However the figure shows no line.

lnR = 0.2*rand(1,500);
X = exp(lnR)-1.1;
a = linspace(0,5,100);
f = @(a) sum(X./(1+a.*X));
for i = 1:length(a)
  g = f(a(i));  
end
plot(a,g)

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Answer 1

KL 2017-10-28

编辑：KL 2017-10-28

在 MATLAB Online 中打开

1 个投票

Alright, you have defined lnR and X correctly,

lnR = 0.2*rand(1,500);
X = exp(lnR)-1.1;

Then they have asked you to define an inline function, I'd recommend to read this link: https://de.mathworks.com/help/matlab/matlab_prog/anonymous-functions.html

For your case,

func = @(alpha) sum(X./(1+alpha.*X));

Now you have to define alpha in the interval 0 to 5 with 100 mesh points,

hint: alpha=linspace(from,to,no_of_points)

then you have to pass alpha to func to calculate g, you will get one value of g for every alpha, so finally you will have 100 g, which you can plot using,

plot(g)

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KL 2017-10-28

在 MATLAB Online 中打开

replace

g = f(a(i));

with

g(i) = f(a(i));

this way you store results from every iteration in an array, previously you had been overwriting.

Yuhang Ma 2017-10-28

Thank you so much!

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Plotting summation function in loop

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