Appending letters to number

I need to append CF in front of number to send a signal to a field controller. I need the output to be i.e. 'CF2000', with the single quotations.

my code is:

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

centerField = 'CF'; %appends CF in front of field value

Field = strcat('',[centerField,setField],'');

g = handles.g;

fprintf(g, Field);

However when I use strcat I get 'CF' '2000'

Is there a way to fix this?

The final send command should read fprintf(g, 'CF2000') where the 2000 can be any number I set in the edit1 box.

Thanks

Umar

Answer 1

[John BG]

your syntax of strcat is not clear:

where you write

Field = strcat('',[centerField,setField],'')

you may want to write

Field = strcat(centerField,setField)

in your strcat, you are concatenating [' '] to [centerField setField] and to [' ']

Since you do not give details about setField, it's possible that as you are getting the handle, setField is a number. If you try to concatenate numbers and numbers into a solid string, use

num2str(setField)

or on any other numeric value before

strcat(str1,str2,str3, ..)

you don't really need the spaces do you?

If you find this answer of any help solving your question, please click on the thumbs-up vote link,

thanks in advance

John

[e-mail]

[Umar Twahir]

John

The issue at hand is the format of the value that I get out of the

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

I have made a GUI to control a magnet field controller. I have it set up that you can enter the field value in the edit text box from the computer keyboard or a keypad in the GUI. And example of an entered value is 2000.

The command that has to be sent to the controller to set the field is

fprintf(g, 'CF2000'), with g referring to the gpib connection.

I do not want the user to have to enter CF before entering the field value so I am trying to use strcat to add it to the front of the value before executing the fprintf command. The command to the controller has to include single quotes around CF2000, so I tried to add the single quotes at the same time that I appended CF to the front of the value. The issue I was having at that step was that it would separate the into 'CF' '2000' as the output of strcat.

So I am trying to find a way to add CF to the front of the value back of the envelope and hopefully generate a new value such as

Field = 'CF2000' where 2000 is any input value. This way I can send the command in the format of

fprintf(g, Field)

Thanks in advance for any advice.

Umar

Answer 2

[Steven Lord]

From your description, setField is not the char array '2000' but a cell array with one cell where the contents of that cell is the char array '2000'. Compare:

CH = '2000'
CA = {CH}
s1 = strcat('CF', CH)
s2 = strcat('CF', CA)
s3 = ['CF' CH]
s4 = ['CF' CA]
whos

Pay close attention to which of those variables are char arrays and which are cell arrays containing a char array. For purposes of FPRINTF, you're going to want to use one of the char arrays.