re entering a user inputted variable

Question

Mark Grano 2012-10-27

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/52014-re-entering-a-user-inputted-variable

hello, i just have one very very minor issue with another area in which i need to make sure the number is ten digits long after everything is taken out, and if it is not ten digits long, it needs to ask to enter stra again and re run the program.

i have clear;clc;

stra =input('Enter a 10 digit phone number: ','s');
num2str(stra());
nbrs = regexpi(stra, '\d');
nbrx = stra(nbrs);
num2str(nbrx());
cnt=length(nbrx);
if length(nbrx)<10
      clear;clc;    disp('Invalid input'); strb=input('Please enter a TEN digit phone number: ','s');     stra=strb;end
a=(nbrx(1));

although when i run this fragment i get an error. any thoughts on how to fix this? i imagine its simple. its just when i re enter stra it does not put it through the first part of the program that converts stra into what nbrx is. i get an error that nbrx is undefined.

7 个评论
显示 5更早的评论隐藏 5更早的评论

Mark Grano 2012-10-27

why won't it re-calculate it? shouldn't it re input stra back into all the previous functions with the new value?

Walter Roberson 2012-10-27

在 MATLAB Online 中打开

No. When you have an expression such as

nbrx = stra(nbrs);

then nbrx would be calculated with the values of stra and nbrs that were active right at the time the statement executed, and no "history" of having been calculated from stra and nbrs would be recorded and "replayed" to recalculate nbrx when new values were assigned to any of the variables. If you want to recalculate nbrx then you need to have another executable statement that calculates it.

And besides, remember that you "clear" in the meantime: if history of how nbrx had been kept somehow, you would have asked to have erased it by executing the "clear".

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Image Analyst 2012-10-27

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/52014-re-entering-a-user-inputted-variable#answer_63425

在 MATLAB Online 中打开

Here's one way to do it:

defaultValue = '(123)456 - 7890';
titleBar = 'Enter the number';
userPrompt = 'Enter the 10 digit phone number';
numberCount = 0;
while numberCount < 10
  % Ask user for a number.
  caUserInput = inputdlg(userPrompt, titleBar, 1, {num2str(defaultValue)});
  if isempty(caUserInput),return,end; % Bail out if they clicked Cancel.
  strInput = char(caUserInput)
  numberCount = 0;
  theNumber = [];
  [a1 a2 a3 a4 a5 a6 indexes] = regexpi(strInput, '\d')
  numberCount = length(a4)
  onlyTheNumbers = char(a4)
  fprintf('The numbers = %s\n', onlyTheNumbers);
end
msgbox('Success!');

2 个评论
显示无隐藏无

Mark Grano 2012-10-27

i like your style with the menu. i want to learn how to use those in my projects. but this works great except for i don't want it to calculate anything when the user enters less than ten digits. it needs to say that it was invalid and ask the user to re enter the number. the rest of the program actually produces the keytones that sound when you actually dial them on a phone. just so you don't think thats the whole program haha. thanks again

Mark Grano 2012-10-27

nevermind, i just realized that it works perfect! haha, i thought it was still running the numbers through the program even if there wasn't enough, but it wasn't.

Thank you!

请先登录，再进行评论。