Field text- number

Hi,

if I write integer number like 4 into field text, thens it is ok.

But when I write floating number like 4.5 into field text, then write error...

How can I do this?

Thanks

[Aldin]

Do you work in MATLAB GUI?

[Aldin]

I don't know but i quess this is what you want:

set(handles.edit1,'String',num2str(4.5));

Answer 1

[Aldin]

I have tested my code:

set(handles.edit1,'String',num2str(4.5));

It's correct.

[john]

Sorry, my mistake....yes in GUI.

But if I write integer number into field text, I want to show for example " This is ok" .

But when I write floating number into field text, then I want to show for example " error-you inserted floating number, please insert integer number"

[Aldin]

Please paste your code here it's confused to me to understand.

[john]

v=str2double(get(handles.edit5,'String'));

if ((v<=0)||(isnan(v))) % I need add condition for floating number

set(handles.text5, 'String','error-you inserted floating number, please insert integer number!');

else

set(handles.text5, 'String','This is ok!');

[Aldin]

Your code is for action for Button, right?

[john]

Yes :)

[john]

and also in condition "if" I need add condition for number with "," for example "3,57987"

[Aldin]

Put this as your Button action:

num = get(handles.edit1,'String');

if str2double(num) < 0

set(handles.edit2,'String','error-you inserted floating number, please insert integer number!');

else

set(handles.edit2,'String','This is OK');

end

[Aldin]

"3.57987" is in MATLAB not correct. The correct way is: 3.57987

[john]

Sorry, but num = get(handles.edit1,'String');

if str2double(num) < 0

doesn't work ...

[john]

and I want to add condition for number with coma 3,4342 and with dot 4.4324

and when I write any string, then I want to show " This is ok" .

So, string and integer number is OK, but number with coma and dot are not OK.

[john]

In the number, or string, can I find symbol " , " or " . "?

[Aldin]

Copy/Paste this code it works:

string = get(handles.edit1,'String');

if length(string) >= 2

if strcmp(string(2),'.') | strcmp(string(2),',')

set(handles.edit2,'String','error-you inserted floating number, please insert integer number!');

else

set(handles.edit2,'String','This is OK');

end

else

set(handles.edit2,'String','This is OK');

end

[Walter Roberson]

357987E-5

is a floating point number that has no "." and no ","

NaN does not have "." or ",". inf and -inf do not either.

if ~all(ismember(string, '0123456789'))

%not a non-negative number

end

You need to decide about negative numbers, and you need to decide about 0.

[Aldin]

"357987E-5" is string, right?

[Walter Roberson]

>> class(357987E-5)

ans =

double

[Aldin]

But when yout type in text file "357987E-5" it becomes string, because:

get(handles.edit1,'String');

[Walter Roberson]

The code above almost all has str2double() calls.

Anyhow, if you put '357987E-5' in to the String field of handles.edit1 and run your code noted above, then because no character in it is a '.' or a ',' your code would say it was OK, which is not correct as 357987E-5 does not represent an integer.

[Aldin]

it represent an String. The condition is only for '.' ans ','

[Aldin]

We can use "isstr" function when we type isstr('357987E-5') = 1 it means that is an string or isstr(23.3234) = 0. Right?

[Walter Roberson]

ischar() is the recommended replacement for isstr()

You seem to have lost track of the initial question. "if I write integer number like 4 into field text, thens it is ok. But when I write floating number like 4.5 into field text, then write error..."

If the user writes 357987E-5 in to the field then that is a floating point number and so should, according to the original criteria, create an error. But if the user writes 357987E+5 in to the field then that is an integer and so should not create an error.

When you get() the String of the edit field, you are always going to get a char array as output, whether that char array contains '357987E-5' or '23.3234' . At the point before you do any str2double(), you just have a string, no matter what that string contains.

Vansac, change your code from

v=str2double(get(handles.edit5,'String'));

if ((v<=0)||(isnan(v)))

to

v = str2double(get(handles.edit5,'String'));

if v<=0 || isnan(v) || ~isfinite(v) || v ~= fix(v)

This also catches infinities.

[Aldin]

Yes, you have right Do you agree it's a little confused question form Vansac?

[john]

Hi guys,

I made combination of your codes:

v=str2double(get(handles.edit5,'String'));

string = get(handles.edit5,'String');

%if length(string) >= 2

%a=length(string)

if v<=0 || isnan(v) || ~isfinite(v) || v ~= fix(v) || strcmp(string(1),'.') || strcmp(string(1),',') || strcmp(string(2),',') || strcmp(string(3),',') .

.

.

if I write for example fhsfuis...error...it works

if I write for , ...error...it works......command strcmp(string(1),',')

if I write for . ...error...it works

if I write for 6.5757 ...error...it works

if I write for 6,676 ...error...it works ...command strcmp(string(2),',')

if I write for 43,7 ...error...it works...command strcmp(string(3),',')

but if I write for 564,87 ...thens is not error...this doesn't works....is possible to make automatically create command strcmp(string(1),',')???

Walter, command if v<=0 || isnan(v) || ~isfinite(v) || v ~= fix(v) doesn't work for numbers with ","...I don't know why...therefore I made the above combination

[john]

Hi, can you help me please? I have always problem with coma ","

If I write number only with one decimal place for example: 5,5 or 34,4 or 434,9 or 4533,5 or 45353,3 then it works,.

..

..

..but if I write for example 5,55 or 5,555 or 43,4534 then it doesn't work.

.

.

.

here is my code

if length(string) >= 2

a=length(string)-1

if ((v<=0) || (isnan(v)) || (~isfinite(v)) || (v ~= fix(v)) || strcmp(string(1),'.') || strcmp(string(a),','))

set(handles.text3,'String','Error');

end;

end;

[Aldin]

Here is on maybe better solution: use *find* function.

For example if you have string like this:

>>string = '453,45434';

you can use *find* function you have to check if there in string exist comma: find(string==',') the result will be 4.

Now, if you have string like this: >>string = '4534434' (without comma) the result for _find(string==',')_ will be Empty matrix: 1-by-0. I hope my advice will be helpful

[john]

Great idea, find(string==',') is very helpfull, thank yuo again