Live script fprintf temporarily not printing whole line

7 次查看（过去 30 天）
Zel Hurewitz
Zel Hurewitz 2024-8-23
编辑： Jatin 2024-9-6
Ran in:
While doing a bunch of file IO in a Live Script, and printing with fprintf, sometimes the line does not complete printing. Temporarily, it looks like the image below until the next iteration begins.
I was able to sort of recreate the effect with the code below, but what can be only a flicker in the execution of this snippet is much more noticable on my other project.
for i= 1:10
fprintf("Hello %d\n",i)
B= inv(rand(3000)+ 2*eye(3000));
end
Hello 1 Hello 2 Hello 3 Hello 4 Hello 5 Hello 6 Hello 7 Hello 8 Hello 9 Hello 10
Is this a bug or am I missing something?
  2 个评论
Walter Roberson
Walter Roberson 2024-8-23
This does not surprise me.
Output within Live Script is buffered. There are weird effects. For example
hold on
for i = 1 : 10
plot(rand(1,5));
fprintf("Hello\n");
end
plot(0.5,1,'*');
will display all of the text first and the plot at the end, but
hold on
for i = 1 : 10
plot(rand(1,5));
fprintf("Hello\n");
end
will display all except one of the text first, then the plot, then the last text.
dpb
dpb 2024-8-24
Never use live script so no experience, but...I don't suppose a drawnow will make any difference here? Does disp act any differently?

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回答（1 个）

Jatin
Jatin 2024-9-4
编辑：Jatin 2024-9-6
Ran in:
Hi @Zel Hurewitz,
I agree with what you mentioned, ‘fprintf’ does behave inconsistently in live editor. I’ve also faced the similar issue where the output of 'fprintf' is buffered.
For example,
for k = 1 : 10
fprintf('Hello: %d', k);
if k < 10
fprintf(",");
end
end
Hello: 1
,
Hello: 2
,
Hello: 3
,
Hello: 4
,
Hello: 5
,
Hello: 6
,
Hello: 7
,
Hello: 8
,
Hello: 9
,
Hello: 10
This code adds a new line with 'fprintf' in live editor which is not seen in standard script, as a workaround to the issue, Kindly check if wrapping the code inside a function as below helps your cause.
fun(10)
Hello: 1,Hello: 2,Hello: 3,Hello: 4,Hello: 5,Hello: 6,Hello: 7,Hello: 8,Hello: 9,Hello: 10
function fun(K)
for k = 1 : K
fprintf('Hello: %d', k);
if k < K
fprintf(",");
end
end
fprintf("\n");
end
Kindly refer to the following MATLAB Answer to know more on how to resolve this issue:
https://www.mathworks.com/matlabcentral/answers/770853-inconsistent-behaviour-in-fprintf-output-scripts-and-livescripts?s_tid=answers_rc1-1_p1_Topic
Hope this helps!

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