re entering a user inputted variable
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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.
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Walter Roberson
2012-10-27
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".
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Image Analyst
2012-10-27
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!');
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