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# Brian Hart

25 total contributions since 2018

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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,...

12 months ago | 0

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

12 months ago | 0

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...

1 year ago | 0

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 ...

1 year ago | 0

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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...

1 year ago | 0

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.

1 year ago | 0

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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 ...

1 year ago | 0

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...

1 year ago | 0

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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...

1 year ago | 0

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 ...

1 year ago | 1

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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...

1 year ago | 1

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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...

1 year ago | 0

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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 ...

1 year ago | 0

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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...

1 year ago | 1

MATLAB Engine for python

1 year ago | 0

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...

1 year ago | 0

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...

1 year ago | 0

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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...

1 year ago | 0

"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...

1 year ago | 0

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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...

1 year ago | 0

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...

1 year ago | 0

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...

1 year ago | 0

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 ...

1 year ago | 0

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...

1 year ago | 0

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