While loop stops before meeting conditions

Question

Thibaut 2020-4-6

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/515797-while-loop-stops-before-meeting-conditions

回答： Srivardhan Gadila 2020-4-10

采纳的回答： Srivardhan Gadila

Hi guys,

I am using a while loop with 3 conditions. Here it is :

while (X<90 && Y<90 && Z<90)

...

Or the program stop when I reach these values :

X = 87.55

Y = 87.58

Z = 93.21

Only one condition is true, so why the program stops ?

Thank you very much for your help !

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Torsten 2020-4-6

As written, the program leaves the while loop if at least one condition is false - and this is the case for Z.

Thibaut 2020-4-6

Thank you for your answer, here is my code. I use the program to run Ansys in batch mode.

I first launch a code to have a reference value then I do a while loop (written in Bold below).

% clean-up Matlab's workspace

% ---------------------------

clc

clear

% define some usefull variables

% -----------------------------

KEYWORD = 'Nb_Modes'; %Mot clef rechercé dans le code APDL et qui sera modifié

openMPStackSize = 'SET KMP_STACKSIZE=2048k';

pathToANSYS = '"C:\Program Files\ANSYS Inc\ANSYS Student\v194\ansys\bin\winx64\ANSYS194.exe"'; %Chemin d'accés

workingDirectory = ['"' pwd '"'];

templateScriptName1 = 'APDL.txt'; %Nom du fichier original

jobName = 'TEST';

inputFileName = [jobName '.lgw'];

outputFileName = [jobName '.out'];

fullCommand = [openMPStackSize ' & ' pathToANSYS ' -dir ' workingDirectory ' -b -j ' jobName ' -i ' inputFileName ' -o ' outputFileName];

Nombre_Modes = 50 %Variable utilisée

% clean-up the current directory

% ------------------------------

delete([jobName, '.*']);

templateScriptContents = fileread(templateScriptName1);

% replace keywords in the template script

% ---------------------------------------

inputFileContents = strrep(templateScriptContents, KEYWORD, num2str(Nombre_Modes));

%save the configured script to disk

% ----------------------------------

fileId = fopen(inputFileName, 'w+');

fprintf(fileId, '%s', inputFileContents);

fclose(fileId);

% run ANSYS

% ---------

[status, cmdout] = dos(fullCommand, '-echo');

%Lecture fichier résultats

%S=fileread('Results.txt')

A = regexp(fileread('Results.txt'),'\n','split'); %lecture du fichier contenant les résultats

whichline = find(contains(A,' sum |')); %Caractére à rechercher

% replace keywords in the template script

Modif=A(whichline); %Sélection de la ligne contenant les résultats

Modif1=erase(Modif,"sum"); %Suppression des caractéres

Modif2=erase(Modif1,"|");

%ascii value comparison, char(48) = '0' and char(57) = '9'

X=str2double(regexp(Modif2,'\d+[\.]?\d*','match','once')); % where c is your cell array; %Selection du paramètre X

X_str=num2str(X); %Transformation en string

Modif3=regexprep(Modif2,X_str,""); %Nous retirons le paramètre X

DEL1=str2double(regexp(Modif3,'\d+[\.]?\d*','match','once')); % where c is your cell array; %Nous sélectionnons le prochain paramètre pour ensuite le retirer

DEL1_str=num2str(DEL1,'%2.2f');

Modif4=regexprep(Modif3,DEL1_str,"");

Y=str2double(regexp(Modif4,'\d+[\.]?\d*','match','once')); % where c is your cell array;

Y_str=num2str(Y);

Modif5=regexprep(Modif4,Y_str,"");

DEL2=str2double(regexp(Modif5,'\d+[\.]?\d*','match','once')); % where c is your cell array

DEL2_str=num2str(DEL2,'%2.2f');

Modif6=regexprep(Modif5,DEL2_str,"");

Z=str2double(regexp(Modif6,'\d+[\.]?\d*','match','once')); % where c is your cell array

disp(X)

disp(Y)

disp(Z)

fclose('all')

while (X<90 && Y<90 && Z<90)

Nombre_Modes = Nombre_Modes + 1

% clean-up the current directory

% ------------------------------

delete([jobName, '.*']);

templateScriptContents = fileread(templateScriptName1);

% replace keywords in the template script

% ---------------------------------------

inputFileContents = strrep(templateScriptContents, KEYWORD, num2str(Nombre_Modes));

%save the configured script to disk

% ----------------------------------

fileId = fopen(inputFileName, 'w+');

fprintf(fileId, '%s', inputFileContents);

fclose(fileId);

% run ANSYS

% ---------

[status, cmdout] = dos(fullCommand, '-echo');

%Lecture fichier résultats

%S=fileread('Results.txt')

A = regexp(fileread('Results.txt'),'\n','split');

whichline = find(contains(A,' sum |'));

% replace keywords in the template script

Modif=A(whichline);

Modif1=erase(Modif,"sum");

Modif2=erase(Modif1,"|");

%ascii value comparison, char(48) = '0' and char(57) = '9'

X=str2double(regexp(Modif2,'\d+[\.]?\d*','match','once')); % where c is your cell array;

X_str=num2str(X);

Modif3=regexprep(Modif2,X_str,"");

DEL1=str2double(regexp(Modif3,'\d+[\.]?\d*','match','once')); % where c is your cell array;

DEL1_str=num2str(DEL1,'%2.2f');

Modif4=regexprep(Modif3,DEL1_str,"");

Y=str2double(regexp(Modif4,'\d+[\.]?\d*','match','once')); % where c is your cell array;

Y_str=num2str(Y);

Modif5=regexprep(Modif4,Y_str,"");

DEL2=str2double(regexp(Modif5,'\d+[\.]?\d*','match','once')); % where c is your cell array

DEL2_str=num2str(DEL2,'%2.2f');

Modif6=regexprep(Modif5,DEL2_str,"");

Z=str2double(regexp(Modif6,'\d+[\.]?\d*','match','once')); % where c is your cell array

disp(X)

disp(Y)

disp(Z)

end

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Answer 1

Srivardhan Gadila 2020-4-10

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/515797-while-loop-stops-before-meeting-conditions#answer_425167

As mentioned by @Torsten, the program remains in the while loop "while (X<90 && Y<90 && Z<90)" only when the values of all the variables X, Y & Z are less than 90. Since the value of Z is 93.21 which is greater than 90, hence the program exits the while loop.