Chris Perkins
MathWorks
自 2017 起处于活动状态
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I joined MathWorks after finishing my undergraduate degree in Computer Science from the University of Rochester.
10 of your answers have been accepted
Awarded to Chris Perkins on 15 Feb 2022
Contribute at least one answer each month for 3 consecutive months
Awarded to Chris Perkins on 06 Feb 2018
3 of your answers have been accepted
Awarded to Chris Perkins on 21 Aug 2017
Provide your first answer ever to someone else's question
Awarded to Chris Perkins on 08 Aug 2017
Feeds
已回答
I have a cell array A and a cell array B and want to re-order info in A according to B.
Here's one approach you could use to re-order the elements of A in a new cell, C: % Assuming A and B are already loaded int...
I have a cell array A and a cell array B and want to re-order info in A according to B.
Here's one approach you could use to re-order the elements of A in a new cell, C: % Assuming A and B are already loaded int...
6 years 前 | 0
| 已接受
已回答
waitforbuttonpress not working after print call
Hi Haebom, I have replicated this on my end, and observed similar behavior. From what I saw, it appears that mouse clicks are...
waitforbuttonpress not working after print call
Hi Haebom, I have replicated this on my end, and observed similar behavior. From what I saw, it appears that mouse clicks are...
7 years 前 | 0
| 已接受
已回答
Images being shrunk when added to uiaxes in AppDesigner
Hi, Take a look at Duncan's answer on this MATLAB Answers post: <https://www.mathworks.com/matlabcentral/answers/360670-im...
Images being shrunk when added to uiaxes in AppDesigner
Hi, Take a look at Duncan's answer on this MATLAB Answers post: <https://www.mathworks.com/matlabcentral/answers/360670-im...
7 years 前 | 0
已回答
How to integrate using a for loop and plot the result?
Hi Andrea, You can use "linspace" to create a large number of points over your given range, then calculate the function value...
How to integrate using a for loop and plot the result?
Hi Andrea, You can use "linspace" to create a large number of points over your given range, then calculate the function value...
7 years 前 | 1
已回答
Looking for string sequence within excel table with an unidentified number of spaces inbetween characters
Hi Saeid, You can remove all spaces using "regexprep" before doing the comparison. For example, % Setting up sample str...
Looking for string sequence within excel table with an unidentified number of spaces inbetween characters
Hi Saeid, You can remove all spaces using "regexprep" before doing the comparison. For example, % Setting up sample str...
7 years 前 | 0
已回答
How to apply a function to an indexed array without loop
Hi Laura, You might be able to re-structure your problem a bit and use "arrayfun", which applies a function to each value in ...
How to apply a function to an indexed array without loop
Hi Laura, You might be able to re-structure your problem a bit and use "arrayfun", which applies a function to each value in ...
7 years 前 | 0
已回答
input to a web page with script
Hi Farhad, To just open a webpage, you can use the function "web", as described in the following documentation page: <htt...
input to a web page with script
Hi Farhad, To just open a webpage, you can use the function "web", as described in the following documentation page: <htt...
7 years 前 | 0
已回答
App Designer: Using function outputs as variables within other functions
Hi Sam, The best way of storing data in one function in an AppDesigner app for use in another function is to create a new 'pr...
App Designer: Using function outputs as variables within other functions
Hi Sam, The best way of storing data in one function in an AppDesigner app for use in another function is to create a new 'pr...
7 years 前 | 8
| 已接受
已回答
How do you generate specific values on random points?
Hi Ian, If I understand your question correctly, you want to be able to associate a certain number (either 0 or 1) with each ...
How do you generate specific values on random points?
Hi Ian, If I understand your question correctly, you want to be able to associate a certain number (either 0 or 1) with each ...
7 years 前 | 0
已回答
How do I plot a double integral ?
Hi Robin, To calculate a definite double integral in MATLAB, you can use the function "integral2", which is described on the ...
How do I plot a double integral ?
Hi Robin, To calculate a definite double integral in MATLAB, you can use the function "integral2", which is described on the ...
7 years 前 | 1
| 已接受
已回答
How to save figures directly to a folder without having them display?
Hi Zach, When you create a figure, you can set the 'visibile' property to 'off', which will cause it not to display. Then any...
How to save figures directly to a folder without having them display?
Hi Zach, When you create a figure, you can set the 'visibile' property to 'off', which will cause it not to display. Then any...
7 years 前 | 2
| 已接受
已回答
variation of columns in textscan
Hi Mikkel, You can use the function "strcat" to programmatically combine smaller formats to build up your final formatSpec. ...
variation of columns in textscan
Hi Mikkel, You can use the function "strcat" to programmatically combine smaller formats to build up your final formatSpec. ...
7 years 前 | 0
| 已接受
已回答
Group bar graph, with different group sizes?
Hi Tracy, As a matrix in MATLAB cannot have a different number of columns per row, you will have to pad any rows that are not...
Group bar graph, with different group sizes?
Hi Tracy, As a matrix in MATLAB cannot have a different number of columns per row, you will have to pad any rows that are not...
7 years 前 | 0
已回答
How to dispaly the value in imshow
Hi Kwanghun, You can use "annotation" to place text on your figure. Here is an example: % Just setting up a sample ...
How to dispaly the value in imshow
Hi Kwanghun, You can use "annotation" to place text on your figure. Here is an example: % Just setting up a sample ...
7 years 前 | 0
| 已接受
已回答
Using aoctool in the right way
Hi Eric, "aoctool" should work fine for your use case, given your description. The fact that one group might have more elemen...
Using aoctool in the right way
Hi Eric, "aoctool" should work fine for your use case, given your description. The fact that one group might have more elemen...
7 years 前 | 0
已回答
matlab load file and plot
Hi Haowei, You can read TXT files into MATLAB using various methods, including: The Import Tool, as described in the follo...
matlab load file and plot
Hi Haowei, You can read TXT files into MATLAB using various methods, including: The Import Tool, as described in the follo...
7 years 前 | 0
已回答
Scatter plot: Slightly wrong position of measurement points when they are drawn as circles
I ran your reproduction code in several versions of MATLAB. In R2017a and R2016b, I observe the same issue that your image sh...
Scatter plot: Slightly wrong position of measurement points when they are drawn as circles
I ran your reproduction code in several versions of MATLAB. In R2017a and R2016b, I observe the same issue that your image sh...
7 years 前 | 0
| 已接受
已回答
How can I separate Complicated CSV file
Hi Barry, Since there is no marker present in the CSV file to say which rows are headers and which contain data, and since th...
How can I separate Complicated CSV file
Hi Barry, Since there is no marker present in the CSV file to say which rows are headers and which contain data, and since th...
7 years 前 | 0
| 已接受
已回答
How to begin with multiple graphs of 'y(x+1)=y(x)+0.02*randn;' from x=1? i.e. 10 graphs?
Hi Karolina, If I understand your question correctly, you want multiple graphs created, and then to plot your function on all...
How to begin with multiple graphs of 'y(x+1)=y(x)+0.02*randn;' from x=1? i.e. 10 graphs?
Hi Karolina, If I understand your question correctly, you want multiple graphs created, and then to plot your function on all...
7 years 前 | 0
已回答
Matlab throws Java errors when opening help or internal browser
Hi George, Based on the exception, it seems likely this is being caused by you not having write permission for your temp dire...
Matlab throws Java errors when opening help or internal browser
Hi George, Based on the exception, it seems likely this is being caused by you not having write permission for your temp dire...
7 years 前 | 1
已回答
How to access the variables with similar name in different mat files in sub-folders
Hi Duminda, Here's a quick example of loading files as you describe and combining the data into one new array. I scaled-do...
How to access the variables with similar name in different mat files in sub-folders
Hi Duminda, Here's a quick example of loading files as you describe and combining the data into one new array. I scaled-do...
7 years 前 | 0
已回答
Global Optimization Toolbox - Activate trial
Hi Gloria, Installing a trial toolbox follows the same process as installing a professionally licensed toolbox. You will ...
Global Optimization Toolbox - Activate trial
Hi Gloria, Installing a trial toolbox follows the same process as installing a professionally licensed toolbox. You will ...
7 years 前 | 0
已回答
How can I reactivate MATLAB Student Version R2016b?
Hi Jiabo, Refer to the following MATLAB Answers post for reactivating Student Versions between R2008b and R2013b: <https:/...
How can I reactivate MATLAB Student Version R2016b?
Hi Jiabo, Refer to the following MATLAB Answers post for reactivating Student Versions between R2008b and R2013b: <https:/...
7 years 前 | 0
| 已接受
已回答
Select all the data in listbox using single click of pushbutton
Hi Ghanshyam, In your 'Select All' pushbutton callback, you can add the following code to select all elements currently displ...
Select all the data in listbox using single click of pushbutton
Hi Ghanshyam, In your 'Select All' pushbutton callback, you can add the following code to select all elements currently displ...
7 years 前 | 0
| 已接受
已回答
How do you perform nominal multi class logistic regression
Hi Jason, You should be able to use the example 'Train Multiclass Linear Classification Model' on the documentation page for ...
How do you perform nominal multi class logistic regression
Hi Jason, You should be able to use the example 'Train Multiclass Linear Classification Model' on the documentation page for ...
7 years 前 | 0
| 已接受
已回答
Sparse matrix with diagonal zero and elements in every row/column
Hi Evelyn, The code below shows how to compute a sparse square matrix where each row and column have at least one non-zero va...
Sparse matrix with diagonal zero and elements in every row/column
Hi Evelyn, The code below shows how to compute a sparse square matrix where each row and column have at least one non-zero va...
7 years 前 | 0
| 已接受
已回答
.fig or .crg into 3D World Editor
Hi Stefan, The only file types supported by the 3D World Editor are VRML and X3D. You can convert STL files to VRML or X3D...
.fig or .crg into 3D World Editor
Hi Stefan, The only file types supported by the 3D World Editor are VRML and X3D. You can convert STL files to VRML or X3D...
7 years 前 | 0
已回答
How to interpret log probability from hmmdecode?
Hi Austin, That is the correct way of interpreting the probability, which in this instance is almost zero. However, the given...
How to interpret log probability from hmmdecode?
Hi Austin, That is the correct way of interpreting the probability, which in this instance is almost zero. However, the given...
7 years 前 | 1
已回答
Issue Regarding KL divergence Implementation in MATLAB
Hi Muhammad, KL Divergence produces a number between 0 and 1, where 0 indicates the expectation of extremely similar behavior...
Issue Regarding KL divergence Implementation in MATLAB
Hi Muhammad, KL Divergence produces a number between 0 and 1, where 0 indicates the expectation of extremely similar behavior...
7 years 前 | 0
| 已接受
已回答
Help with data-fitting using lsqcurvefit and MultiStart
"MultiStart" can help improve results. It works to find a global minimum, rather than a local minimum, so when "lsqcurvefit" fin...
Help with data-fitting using lsqcurvefit and MultiStart
"MultiStart" can help improve results. It works to find a global minimum, rather than a local minimum, so when "lsqcurvefit" fin...
7 years 前 | 1
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