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Brian Hart


Active since 2018

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  • Knowledgeable Level 3
  • 6 Month Streak
  • Knowledgeable Level 2
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Answered
Add Gaussian noise to mesh or point cloud
You can generate normally-distributed random values with randn. For a point cloud for example, if you have 100 points with x, y,...

5 years ago | 0

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Answered
Error when using createMask
Hi Manuel, A mask is created from an ROI (region of interest), not an image. First you need to create an ROI with drawellipse, ...

5 years ago | 0

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How to make a table and 2D graph of 3 variables?
I'm not sure about the "table" you want. Here's a simple example of how to define two vector values, then compute a 2D result an...

5 years ago | 0

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Input dialog boxes accepts binary bit sequence
Hi Lorrenzo, MATLAB doesn't support binary representation. So when you run the above code, MATLAB thinks the value in temp2 is ...

5 years ago | 0

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Answered
Changing Axes direction with positive z-axis downwards
Hi Ryan, The first step is to change your second line to say f = figure(1); This gives you a handle to update the figure prop...

5 years ago | 3

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Answered
A code will prompt the user to try to guess my favourite colour and after 3 goes say 3 trials over, but i want to display a message after each incorrect attempt saying "Incorrect try again". How do I do this? (New user)
add the code disp('Incorrect try again') right before your very last end statement

5 years ago | 0

Answered
extraction of a specific slice from the 3D shepp Logan phantom to reconstruct it
If it's a standard 3D array, you can do something like slice = image(:,:,64) to get the 64th slice.

5 years ago | 0

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Answered
Why is my graph coming out blank when i try and plot this code?
It's an error in your calcuation of y. Check the size and you'll see it's coming out as a scalar. Replace "/" with "./", since ...

5 years ago | 0

Answered
How do I change the function for certain points in a for loop
I suggest making an "other function" variable that has the values for which you want to use the other function. Then do an IF te...

5 years ago | 0

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Answered
How to reference each element of a column vector in an if statement
Hi Brian, You need to use subscripts to index the Spin variable, as well as x. For example, if Spin(jj) <= .99999 Amou...

5 years ago | 0

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Answered
How do I plot the angle
Hi Umut, This is a neat problem! Some nice physics with rectangular-to-polar conversions and trig asymptotes. My code to solve ...

5 years ago | 1

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Answered
Deleting Entries in an Array
Hi Ramitha, You almost got it. For your last line of code, try A(vals,:)=[]; The way you tried it at first uses linear lindex...

5 years ago | 1

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Answered
Bounding Boxes at any points
Hi arun, Here's some code to do what you asked, but with everything in units of the graph/plot (not mixing mm / pixel coordinat...

5 years ago | 0

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Answered
2d coordinate transformation specified origin matlab
Hi Reuben, You're almost there. The basic idea is to subtract the rotation point value from the target point, so that you ARE ...

5 years ago | 0

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Answered
how to plot image signal ?
Hi Tim, Try replacing "plot" with "imshow". Also need to remove the quotes from the second command in the last line... subplot...

5 years ago | 1

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MATLAB Engine for python
Try using sys.addpath in Python.

5 years ago | 0

Answered
How can i detect max value and his index ?
Let's say your vector is a =[1 2 5 NaN NaN 9 0 23 12 NaN NaN NaN 6 2 8] Then the m...

5 years ago | 0

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how to create this matrix?
Hi diadalina, I think it would look something like this... iLength = 5; %rows jLength = 7; %cols b=zeros(iLength, jLengt...

5 years ago | 0

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Answered
Read mixed numbers in Matlab
Here's some code to read the data in as a table, then update the mixed number values in each row to the decimal... T = readtabl...

5 years ago | 0

Answered
"cleaning" a horizontal line removal code for object detection.
Hi Janrex, For a nice clean image like this, there's a very simple solution. Just compute a row sum; rows with staff lines have...

5 years ago | 0

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Answered
keep the number give by bwlabel to one object constant in all images of an image sequence
Hi Sofia, I assume these 10 images are related; that they show a changing field. I think the only way to do what you want is t...

5 years ago | 0

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how can i make the result number from convolution become positive?
Convolution results can be negative. If you want only positive results, two options are to either take the absolute value of th...

5 years ago | 0

Answered
Undefined function 'int' for input arguments of type 'char'. keep getting error using matlab2015b
In the first line you define an eqution as a text string (in quotes). Then in the second line you pass that text string into the...

5 years ago | 0

Answered
Issue with table data creating strings and recognising as numbers
Hi Hannah, Try replacing, for example, nTxc=c(:,2)); with nTxc=a.cmes100917(:,2).mag_magnetic_field_mso_xnT; (I used tab ...

5 years ago | 0

Answered
Beginner question about for loops and indexing
Hi Callum, You're really close. First, you can move the "r = ... " line outside the loop to do the operation on the whole arra...

5 years ago | 0

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