Image not able to detect SURF features

I have a image and I am trying to detect SURF features points on image. Instead of detecting features points , I am getting error as :

Operands to the || and && operators must be convertible to logical scalar values.

Error in vision.internal.FeaturePoints/plot (line 152)

if k==1 && ~wasHeld

Error in SURFPoints/plot (line 172)

h = [e-mail](this, ...

Error in surf_features (line 31)

plot(selectStrongest(boxPoints, 50));

boxImage1 = imread('C:\Users\prayag\Desktop\images-capstone\gandhi_crop.jpg') ;
boxImage = rgb2gray(boxImage1) ;
boxPoints = detectSURFFeatures(boxImage);

figure;
imshow(boxImage);
title('50 Strongest Feature Points from Box Image');
hold on;
plot(selectStrongest(boxPoints, 50));

This is the code I am using.

and below is the image I am using.

Answer 1

[Alok Nimrani]

This error is seen if the operands being evaluated by the short-circuit || and && operators are empty or non-scalar arrays. If yes, please use the logical and (&), or (|) operators for those non-scalar operands.

One way to verify this could be to identify the line which is throwing this error. You can do so as folllows:

1) You can halt the execution of the code at the point when the error occurs by using the following command in MATLAB.

>> dbstop('if','error')

2) Once the above command is executed, execute the MATLAB script / function in the same command Window. For example

>> sample_script.m

3) Now the execution will halt at the line in the script which throws error. Please confirm if any of the operands used by || or && in this line is non-scalar (by checking the value of the operand variables in the MATLAB workspace).