I can't plot during my loop! Help!

2016 3 2
1 个回答
更新时间：2016 3 2
11 次查看（30 天）

0 个投票

if true
disp('Question 3')
nMAX = input('Enter nMAX');
sumX=0;
i=1;
while i<=nMAX
plot(i,sumX); hold on
sumX = sumX + 1/i^2;
i=i+1;
end
disp('The sum of the series is');
disp(sumX);
disp('END Question 3');
end
The above is my code, when I try to plot, nothing appears. Im new to matlab so go easy lol. I would like to put sumx against i for 1:50. Thanks.

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回答（1 个）

0 个投票

Hi you could use
plot(i,sumX,'k*'); % set black asterisk

4 个评论
显示 2更早的评论 隐藏 2更早的评论

Bikram Singh
Bikram Singh 2016-3-2
Hi, thanks it does work.... but could you explain why that works and is there a way to just make the plot a line rather than a set of points?
Konstantinos Sofos
编辑：Konstantinos Sofos 2016-3-2
To make a line you need to have vectors...in your case you give just points...one possibility would be
if true
disp('Question 3')
nMAX = input('Enter nMAX : ');
sumX=0;
for i = 1 : nMAX -1
sumX(i+1) = sumX(i) + 1/i^2;
end
plot(1:nMAX,sumX);
disp('The sum of the series is');
disp(sumX(end));
disp('END Question 3');
end
Bikram Singh
Bikram Singh 2016-3-2
So, how would I adjust the code to make this happen? Sorry, very new to Matlab.
Walter Roberson
Walter Roberson 2016-3-2
That is the adjusted code that Konstantinos posted.

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