Form of number

Hi,

if I enter into edit text a number 6.67e-2, then in uitable I got this number in form like 667/10000.

So is possible to show this number in form of 6.67e-2?

Thanks for help

[john]

At firts I convert number 6.67e-2 into cell UserData.matrix(3,2)=num2cell(str2double(get(handles.edit7,'String')));.

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then in other part of program I use data(i,j)=sym(UserData.matrix{i,j}); for print number in uitable

Answer 1

[Matt Tearle]

It looks as if the table's ColumnFormat property is set to rat, but that would require setting the property. It looks like you're using GUIDE, so open up the Property Inspector on the uitable and see what the ColumnFormat property is. Set it to an appropriate numeric format.

EDIT TO ADD: sorry, didn't read your initial comment carefully enough. Um... why are you converting to a sym to print the number? If you need a symbolic variable somewhere, extract from UserData.matrix and convert there. Rational display is standard for symbolic variables, so the behavior you're seeing makes perfect sense.

EDIT #2: OK, so it sounds like the actual problem you're trying to solve is: "can I set the formatting so that numbers and strings are both justified the same (either left or right)?" Yes. Just, treat everything as a string:

figure
h = uitable;
set(h,'ColumnFormat',{'char', 'char'},'Data',{pi,'hello';'42',6.67e-2})

Don't use sym unless you are actually doing symbolic calculations. It is not a fundamental data type in MATLAB, so these conversions aren't really doing much other than slowing down your code.

[john]

Hi, ColumnFormat property doesn't help.

here is problem........if I use this command sym(UserData.matrix{4,2}) I get 667/10000.

[john]

or other question. I have cell matrix with numbers and strings. I insert numbers and strings into cell matrix with command UserData.matrix(3,2)=num2cell(str2double(get(handles.edit7,'String')));...for numbers and UserData.matrix(3,1)=num2cell(sym(get(handles.edit5,'string')));...for strings.

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and I need to show numbers and strings in uitable...so how can I do that?

[Walter Roberson]

I really don't know why you keep using sym() all over the place instead of just when you need to construct a symbolic formula. For example, just use

UserData.matrix{3,1}=get(handles.edit5,'string');

Anyhow, if you must use sym, add the argument 'd' to the sym() call:

UserData.matrix(3,1)=num2cell(sym(get(handles.edit5,'string'), 'd'));

[john]

I use sym because I need UserData.matrix(3,1)=num2cell(-1*sym(get(handles.edit5,'string')));.

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numerical values in uitable are centered to the right side, and texts are centered to the left side....can I centered numerical values to the right side ?....number 6.4535e-3 already in uitable, but in the right side, and others strings are centered to the left....so I looks like lite bit chaos....so is possible all to centered to the left or all to the right side?

[Walter Roberson]

Why does UserData.matrix(3,1) have to be a symbol? Why can you not use

UserData.matrix{3,1} = [ '-(' get(handles.edit5, 'String') ')' ];

That is, just put in the negative sign textually, and not convert to sym until the step where you are ready to do a symbolic calculation?

There is no way to change the centering of numeric values in uitable(). You can change the centering of string values by changing the number of spaces in the string (but watch out for proportional fonts.)

[john]

Yes, I am using a symbolic and also numerical calculation.

Now everything works ok.

For load number in form 4.8893e-4 is used UserData.matrix(3,2)=num2cell((str2double(get(handles.edit7,'String'))));

but function vpa works not correctly :(.

thanks for 'ColumnFormat',{'char', 'char'}....it helped

[Walter Roberson]

The num2cell is unnecessary overhead. Use

UserData.matrix{3,2} = str2double(get(handles.edit7,'String'));

Most of the time you do not need to vpa() a numeric value. There are good reasons to use vpa(), but when you are interfacing with MATLAB itself you are more likely to use double() to convert a symbolic expression to a double precision number.