How to convert fprintf from single row to multiple rows?

Question

Christoppe 2022-6-25

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1748090-how-to-convert-fprintf-from-single-row-to-multiple-rows

评论： Star Strider 2022-6-25

采纳的回答： Star Strider

Screenshot 2022-06-25 215539.png

Hi! I just started using Matlab a couple of days ago. How can I convert this single row into multiple rows?

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Answer 1

Star Strider 2022-6-25

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https://ww2.mathworks.cn/matlabcentral/answers/1748090-how-to-convert-fprintf-from-single-row-to-multiple-rows#answer_993375

There is not enough of the code provided to know what the problem is (and images of code are never appropriate, since actual code that can be copied, pasted, and run is always preferable).

That code should be writing the results 1000 times, so whatever is causing it not to do so is likely ‘over the horizon’ and out of sight here.

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Star Strider 2022-6-25

编辑：Star Strider 2022-6-25

在 MATLAB Online 中打开

I am not certain what the selected input parameters are, however the problem is now obvious.

The calculated value of ‘Error’ is less than the value of ‘Ea’ in the first iteration so the if condition is satisfied (true) and the loop stops. I am not certain how best to correct that, other than to select a much lower value for ‘Ea’ than is currently entered so that the condition is not satisfied on the first iteration.

EDIT — (25 Jun 2022 at 14:54)

There are 9 edit descriptors in the fprintf statement with only 8 inputs. Matching those solved the problem.

With those inputs, and that correction, this runs correctly for me —

% Secant Method in MATLAB
% a=input('Enter function:','s');
% f=inline(a)
a = 'x^3 - 4*x^2 + x - 10'
a = 'x^3 - 4*x^2 + x - 10'
f = str2func(['@(x)' a])
f = function_handle with value:
    @(x)x^3-4*x^2+x-10
% x0 = input ('Enter the first initial guess: ')
% x1 = input ('Enter the second initial guess: ')
% Ea = input ('Enter absolute error: ')
x0 = 3;
x1 = 4;
Ea = 0.0001;
iteration=0;
disp('Iteration x0        x1          x2         f(x0)       f(x1)        f(x2)        Ea')
Iteration x0        x1          x2         f(x0)       f(x1)        f(x2)        Ea
for i=1:1000
    x2 = x0 - ((f(x0))*((x1-x0)/(f(x1)-f(x0))));
    Error = round(abs(x2-x1),4);
    fprintf(['%i %11.5f %11.5f %11.5f %11.5f %11.5f %11.5f %11.5f\n'],i,x0,x1,x2,f(x0),f(x1),f(x2),Error)
    iteration=iteration+1;
    if (Error<=Ea)
        Root=x2
        Error=Ea;
        Iteration=iteration
        break
    end
    x0=x1;
    x1=x2;
end
1     3.00000     4.00000     4.60000   -16.00000    -6.00000     7.29600     0.60000
2     4.00000     4.60000     4.27076    -6.00000     7.29600    -0.79078     0.32920
3     4.60000     4.27076     4.30295     7.29600    -0.79078    -0.08773     0.03220
4     4.27076     4.30295     4.30697    -0.79078    -0.08773     0.00129     0.00400
5     4.30295     4.30697     4.30691    -0.08773     0.00129    -0.00000     0.00010
Root = 4.3069
Iteration = 5

NOTE — The inline function has been (or soon will be) depricated, so use str2func (with or without the vectorize function) instead.

The input function does not work with the online Run feature that I use here.

.

Christoppe 2022-6-25

Hi! I appreiciate the information you have shared with me, and I appreciate your prompt reply.

Star Strider 2022-6-25

As always, my pleasure!

I found it somewhat surprising that the fprintf statement was the problem. I learned something from this.

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Answer 2

Adam Danz 2022-6-25

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1748090-how-to-convert-fprintf-from-single-row-to-multiple-rows#answer_993365

在 MATLAB Online 中打开

I assume you want to show each numeric value in a new line. To do that, add a new line control character where you want to insert a new line,

fprintf('%11.5f\n%11.5f\n%11.5f\n%11.5f\n%11.5f\n', rand(1,6))
50328
90133
47589
81838
27507
93488

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Christoppe 2022-6-25

Enter function:

x^3 - 4*x^2 + x - 10

Enter the first initial guess:

3

Enter the second initial guess:

4

Enter absolute error:

0.0001

Christoppe 2022-6-25

the problem are the answers after 5 iterations they appeared in a single row. what i wanted is like a multiple rows.....

1 x0 x1 answer answer Ea

2 x0 x1 answer answer Ea

3 x0 x1 answer answer Ea

4 x0 x1 answer answer Ea.

5 x0 x1 answer answer Ea

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How to convert fprintf from single row to multiple rows?

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How to convert fprintf from single row to multiple rows?

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