Steven Lord

MathWorks

Last seen: Today | 2002 以来アクティブ

I joined The MathWorks in the Technical Support department during the summer of 2001 and transferred into the Quality Engineering department in March of 2004. I now work qualifying the core MATLAB numerical functions (PLUS, MINUS, LU, FFT, ODE45, etc.)
Professional Interests: mathematics, MATLAB

For assistance with MATLAB question please post to MATLAB Answers or contact Technical Support using the Contact Us link in the upper-right corner of the page instead of contacting me directly.

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Auto-naming a variable based on imported file name
Can you do this? Sometimes. File names are not required to be valid MATLAB identifiers. I can have a file named "3 blind mice.tx...

約12時間前 | 0

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Event function not halting integration
Rather than making your event function return either true or false (or 1 or 0) that indicates whether the event function thinks ...

1日前 | 0

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Matlab logical matrix to C char type
I can understand how you generate the 0x00 and 0xFF values from your logical data, but how do you generate the other values from...

1日前 | 0

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Why does the pca function in MatLab and on mathworks indicate different outputs?
You have a different pca.m that is taking precedence over the pca function included in Statistics and Machine Learning Toolbox. ...

1日前 | 0

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How can I add the percentage result on plotted figure ?
FYI if you want the only marker to be at the highest point you could use MarkerIndices rather than plotting two separate lines. ...

1日前 | 0

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Byte Array / Bit Conversions in a Cell
If all your numeric data is the same type, I recommend storing it in a numeric array rather than as a cell array. Let's make som...

1日前 | 0

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Import Keras Tensorflow model in to Matlab
See the importKerasNetwork function in Deep Learning Toolbox. As that documentation page indicates, you will also need a support...

1日前 | 0

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function - input and output matrix
My suspicion was correct. When you call load with an output argument, that output argument is a struct array with each variable ...

2日前 | 1

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Using a program designed function
You don't want to pass the names of the variables into your function, you want to pass the variables themselves. As a simplified...

2日前 | 0

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Creating index and replacing values
A = [0 0 1 0 1 0 0]; B = [ "030121", "030221", "030321"]; I'm going to assume that A does not start with 1, or if it does that...

2日前 | 0

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Why my normpdf in not working??
Let's evaluate the PDF using the formula in the documentation for normpdf at that large x value. I'll choose the smallest value ...

2日前 | 1

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how to assign numbers to each row of a matrix? knowing that my matrix is 70x4 so that each row has an index from 1 to 70. Thank's
You already have, by storing your data in a matrix. A = magic(5) % Data associated with the number 3 A(3, :) If you have dif...

3日前 | 0

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How to get quotient value after division without round off?
If one or both of the numbers are stored as an integer type you could use the idivide function. idivide(int16(157),2)

4日前 | 0

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Locating Antenna toolbox documentation
As stated on this documentation page: "MathWorks® reserves the use of packages named internal for utility functions used by int...

4日前 | 0

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improper integral: exp(ikx) undefined in Matlab?
What is the value of your integral when k is equal to 0? syms x k; assume(k,'integer'); k = 0; int(exp(1i*k*x),x,-inf,inf) ...

5日前 | 0

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How to solve "Parse error at METHODS: usage might be invalid MATLAB syntax."?
anonymousFunctiononHandle=... @x cost_function_augumented_equality_only(x,alpha) ; This isn't valid MATLAB syntax....

5日前 | 0

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I've been facing this issue the issue is with axes
function UPLOADIM_Callback(hObject, eventdata, handles) % hObject handle to UPLOADIM (see GCBO) % eventdata reserved - to ...

5日前 | 0

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I am using Matlab.mathworks.com and my command area does not print anything
Are you still seeing this behavior or did you only see it in the past? I see a notice on the application status page indicating ...

6日前 | 0

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Mean error for binned values
Rather than calling splitapply multiple times, I'd call groupsummary once and have it operate on multiple data variables at once...

6日前 | 0

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defining a function output properly
So you want to call a function that can return different numbers of outputs and you want to get a number of outputs that is only...

7日前 | 1

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Minimum Spanning Tree - Path or Start-End
If the plot function can do this almost instantly The plot function plays "connect the dots". The start and end of the line to...

7日前 | 0

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Contour is plotting my data in reflected order?
Are you trying perhaps to put the contour plot on top of another graphics object, an image perhaps or maybe a pcolor? If so, see...

7日前 | 0

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Switch results at certain condition
switch is not the right tool for this job. Use if instead. switch is intended when you intend to distinguish between a fixed di...

7日前 | 0

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Find does not work properly
Please provide a small sample of the Horizon variable from where you expected the find call to return data but it does not. My s...

8日前 | 0

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How does division "/" = work for integer types?
See the "Creating Integer Data" and "Arithmetic Operations on Integer Classes" sections on this documentation page.

8日前 | 2

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Why is logical array fasle?
Floating point arithmetic. While k1 and g are displayed the same they do not contain the same value down to the last bit.

8日前 | 0

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Computer crashed when calculating matrix (mixed with sparse and full) multiplication and summation
What release of MATLAB are you using? What operating system? I'm suspect you're going to say Linux. If I'm right, the OOM Kille...

9日前 | 0

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curve fitting tool plot is different from my plot
Show us the code you used to create your plot. Did you use the full double precision values of the coefficients stored in the f...

9日前 | 1

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Curve fitting tool error with custom equation
Does your data contain a point with x = 0? If so the term c*(1/x) is going to give you Inf or NaN (depending on whether or not c...

9日前 | 1

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What does vdp stand for? (Mathworks Example Simulation Model)
The vdp model is a simulation of the Van der Pol oscillator differential equation. It's a fairly simple model to create which is...

9日前 | 0

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