Error using normcdf function

Question

Oliver Lestrange 2020-8-22

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/583049-error-using-normcdf-function

回答： Star Strider 2020-8-22

采纳的回答： Star Strider

在 MATLAB Online 中打开

Hi,

I am trying to make a CDF. I am using the array eixoXX.

% --- Executes on button press in densityButton.
function densityButton_Callback(hObject, eventdata, handles)
% hObject    handle to densityButton (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
handles = rmfield( handles, 'Antena' );
handles = rmfield( handles, 'nAntena' );
handles = rmfield( handles, 'Movel' );
handles = rmfield( handles, 'Rheight' );
handles = rmfield( handles, 'Rwidth' );
i = handles.map.img(:,:,1)==255 & handles.map.img(:,:,2)==255 & ...
               handles.map.img(:,:,3)==255; 
Prx = handles.maxPrxArray;%(i);
minPower = round(handles.minPrx);
maxPower = round(handles.maxPrx);
eixoXX = minPower:.1:maxPower;
size = length(Prx);
figure
plot(eixoXX, cdf('Normal',eixoXX, mean(Prx),std(Prx)))
grid on;

I always get the error:

Error using normcdf>localnormcdf (line 79)

Non-scalar arguments must match in size.

I don't know how de cdf function really works but it seems that is supposed to have a mu and sigma, that's why I have an mean and std.

Can someone explain me what I am doing wrong?

Thanks!

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Answer 1

Star Strider 2020-8-22

0
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https://ww2.mathworks.cn/matlabcentral/answers/583049-error-using-normcdf-function#answer_483464

在 MATLAB Online 中打开

I am guessing that ‘Prx’ is a matrix, not a vector, and apparently ‘eixoXX’ is a vector. In that instance, the mean and std will be vectors. This is not compatible with the Input Arguments requirements of the cdf function.

See if calculating the mean and standard deviation as: