r/matlab

Hello all! Hoping someone can help me out with this. I am working on a physics simulation of a rigid body.

I have two functions, f and g that need to be convolved over time. Here is the difficulty, both functions are unpredictable and therefore I do not know these equations up front and will only know the latest value of each of those functions at each time step in the simulation as it runs. I solved this convolution integral in the time domain as a baseline and compared it to a textbook solution. Obviously, the longer the simulations the more data points the equation has to convolve over. I tried solving it in the frequency domain thinking it would save time by: *ifft(fft(F)fft(G))\*timestep*
When I run a code profiler (doing this in MATLAB), it actually appears that it is taking longer computationally to solve this in the frequency domain versus the time domain if this operation is done at every time step… what am I missing here (yes I even varied the simulation time length to account for different array sizes)? The other thought I had was to figure out how to implement a sliding window so that really old data is excluded…

Any examples I can find online all assume the equations for the two signals to convolve are known up front. What approach did you use? Any help would greatly be appreciated.

Hello all !

I'm trying to play with HDL Coder and the DSP HDL Library with simulink. I have a solid FPGA background.

All these blocks expose ports that looks like AXI-ST ones (data, valid, ready). I know the protocol and it's quirks, but this time I need to simulate it within simulink.

How do you input data (from workspace) to the model while matching the specifications ? I need to send a waveform (audio in this case) to the model.

Thanks all !

I have to print in hexadecimal with big letters value variable of type uint8. I am using fprintf(1, '%#X', value), but the 0x prefix is in upper case, while I want it to be lowercase. How do I achieve that?

I know I can write instead fprintf(1, '0x%X', value), but I want to do it by only modifying the formatting operators. And using fprintf(1, '%#x', value) doesn't print value in uppercase.

guys if you are proficient and free enough , i need help making a simulation of underground tunnels in matlab . open to advice and criticism , i am a beginner in matlab , i can plot work with matrices and do small project but i do need someones help in this. please dm for more details about the project.

I have the following Matlab program:

syms t positive;

Z=laplace(exp(A*t))

ccode(Z,'file','cCodeTest.c')

I want to write the Z function to cCodeTest.c. The problem is that code is written to ccodetest.c, created before.

How to write Z to the cCodeTest.c and not ccodetest.c?

I was working on a project in MATLAB where I needed to import a DATCOM file but no matter what parameters I put, when I import it into MATLAB, the values stored for the control surface coefficients (like DCDI or clroll) are 99999 (NAN). Has anyone experienced anything similar/ has a solution to this?

The input code is as follows-
CASEID ----- MIKOYAN-GUREVICH MiG-17 -----

DIM FT

$FLTCON NMACH=5.0,MACH(1)=0.1,0.2,0.25,0.3,0.35$

$FLTCON

NALPHA=10.0,ALSCHD(1) =-4.0,-2.0,0.0,2.0, 4.0,6.0,8.0,10.0,12.0,14.0$

$FLTCON

NALT=5.0,

ALT(1)= 4500.0,4750.0,5000.0,5250.0,5500.0,

WT=13395.0,LOOP=1.0$

$SYNTHS XCG=11.17,ZCG=0.0,XW=3.63,ZW=0.42,ALIW=1.0,XH=28.73,

ZH=5.24,ALIH=0.0,XV=18.3,ZV=0.0,ZVF=1.0,VERTUP=.TRUE.$

$OPTINS SREF=243.0, CBARR=2.334, BLREF = 9.63$

$BODY NX=8.0,

X(1)=0.0,0.74,8.35,13.14,19.35,24.41,28.41,30.77,

S(1)=5.19,9.32,16.89,16.89,15.94,11.12,5.85,2.5$

NACA-W-6-66-012

$WGPLNF CHRDTP=7.02,SSPNOP=11.32,SSPNE=4.07,SSPN=15.71,

CHRDBP=8.4,CHRDR=14.0,SAVSI=45.0,SAVSO=45.0,CHSTAT=0.25,

TWISTA=0.0,DHDADI=-3.0,DHDADO=-3.0,TYPE=1.0$

NACA-H-6-66-009

$HTPLNF CHRDTP=1.86,SSPNE=5.42,SSPN=5.43,CHRDR=4.69,SAVSI=45.0,

CHSTAT=0.25,TYPE=1.0$

NACA-V-6-66-009

$VTPLNF CHRDTP=3.76,SSPNE=13.41,SSPN=8.18,CHRDR=12.47,SAVSI=55.0,

CHSTAT=0.25,TYPE=1.0$

$SYMFLP

FTYPE=1.0,

CHRDFI=1.407,

CHRDFO=1.407,

SPANFI=1.4,

SPANFO=5.1,

CB=0.12,

TC=0.14,

NTYPE=1.0,

PHETE = 3.03,

NDELTA=7.0,

DELTA(1)=-20.0,-10.0,-5.0,0.0,7.5,15.0,20.0

SCLD=-0.2,-0.1, -0.05,0.0, 0.06, 0.15,0.2

SCMD=-0.2,-0.1, -0.05,0.0, 0.06, 0.15,0.2$

$ASYFLP

STYPE = 4.0,

CHRDFI=2.23,

CHRDFO= 1.85,

SPANFI=9.42,

SPANFO=14.9,

NDELTA=9.0,

DELTAL=20.,15.,10.,5.,0.,-2.5,-5.,-10.,-15.,

DELTAR=20.,15.,10.,5.,0.,-2.5,-5.,-10.,-15.$

DAMP

BUILD

PLOT

NEXT CASE

I did onramp but Im still lost when looking at practice test questions

Having issues trying to set up a particle tracking software for my biophysics research. I am needing to track these very distinct particulates in a video but matlab just doesn't seem to be my friend. I am currently trying to use the particle tracking tutorial from Georgetown but if anyone could give some advice or has anymore questions please shoot me a message.