Nonfinite endpoints or increment for colon operator in index

Hello everyone, I'm creating a code for plotting a function. If I use such function with a proper code it works; however in the GUI, with the same input, I receive the following message:

"Nonfinite endpoints or increment for colon operator in index"

The line of the code is:

q(1:(lf1-1))=qr1*(f(1:(lf1-1))/fr1).^s1;

where lf1 is given by: lf1=round(ft1/delf)+1 (delf is computed inside the function, it isn't 0)

I obtain the input from another gui in the following format:

ft1=str2double(getappdata(0,'ft1'));

Thanks in advance

Answer 1

[Walter Roberson]

I suspect that you have stored ft1 in appdata as numeric rather than string, and that str2double() applied to the numeric value is then returning NaN.

After you do the

ft1=str2double(getappdata(0,'ft1'));

you should debug by displaying class(ft1) and ft1 itself

Another possibility is that in your

q(1:(lf1-1))=qr1*(f(1:(lf1-1))/fr1).^s1;

that fr1 is 0. Where is it getting fr1 from?

[Marco Baglio]

I debugged, every parameter is NaN! I report the second gui code frome where i obtain parameters:

ft1=get(handles.ft1,'String');
setappdata(handles.ft1,'ft1',ft1);

fr1 is set by me (as ft1), the value is 0.2.

[Walter Roberson]

You setappdata of a different place than you getappdata from

[Marco Baglio]

Sorry I don't understand what you mean. In the GUI where I obtain the parameters I wrote:

ft1=get(handles.ft1,'String');
setappdata(handles.ft1,'ft1',ft1);

I verified that in this phase the parameter is a number and not NaN! In the second GUI I wrote:

ft1=str2double(getappdata(0,'ft1'));

This returns NaN.

[Walter Roberson]

You have getappdata(0,...) which tries to get data from the root graphics object, but the data is stored on handles.ft1