HOW I COULD DRAW THIS FUNCTION

2018 12 7
4 个回答
回答已采纳
更新时间：2018 12 13
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IMG_20181203_165117.jpg

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madhan ravi
madhan ravi 2018-12-7
upload the code that you tried
HADIMARGO
HADIMARGO 2018-12-7
x=0:1:50;
syms n;
y=((2/pi)*((-1)^n+1)*(sin(pi*x)))/n;
symsum(y,n,1,inf);
figure(1);
plot(x,y)
i should say that i am a beginner.

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HADIMARGO
HADIMARGO 2018-12-13

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final answer by myself!!
x=linspace(-5,5,1000);
s=0;
for n=1:1:10000
p=((-1)^(n+1)*sin(n*pi*x))/n;
s=s+p;
end
f=(2/pi)*s;
plot(x,f)
final.jpg

更多回答（3 个）

madhan ravi
madhan ravi 2018-12-7
编辑：madhan ravi 2018-12-7

1 个投票

Use cumsum() to define the behaviour of the alternating series:
x=linspace(0,50,10000);
n=1:10000;
y=(2/pi).*cumsum((((-1).^n+1).*(sin(pi.*x)))./n);
figure(1);
plot(x,y)

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HADIMARGO
HADIMARGO 2018-12-7
编辑：HADIMARGO 2018-12-7
so tnx madhan ravi. i will send this answer to my teacher. if it correct i will get 1 score of 20 .
madhan ravi
madhan ravi 2018-12-7
编辑：madhan ravi 2018-12-7
Anytime :) , read more about cumsum() and linspace()

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HADIMARGO
HADIMARGO 2018-12-8

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my teacher say it isnot correct. you should put it in a loop.

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Walter Roberson
Walter Roberson 2018-12-8
If you have TheResult = cumsum(SomeVector) then you can recode that in a loop as
TheResult(1) = SomeVector(1);
for LoopVariable = 2 : length(SomeVector)
TheResult(LoopVariable) = TheResult(LoopVariable-1) + SomeVector(LoopVariable);
end
... Approximately.

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HADIMARGO
HADIMARGO 2018-12-8

0 个投票

can anyone write complete answer with loop?

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