How to save a matrix to be able to use it in another m file

Hi there!

I have a m file which should create a 1x1000001 matrix (called RM03input1to1) of 1s and zeros (depending on the condition in the for loop). I'd like to somehow save that vector somewhere on my computer, then access that same vector (RM03input1to1) in another m file later. Here's my first m file that creates the vector:

function[isi] = OneNeuronFiring(frequency, dtPass, DPass, Amplitude)

tfin = 10000; %Final time value, in seconds

dt = dtPass; %timestep

vth = 1; %threshold voltage (once the neuron reaches this voltage, it fires)

vr = 0; %The reset voltage is 0 (after the neuron fires, its voltage goes back down to 0)

lif1data = []; %array of spike times (when the neuron fires) and relative spike time differences (time between 2 consecituve spike times)

tau = 1; %membrane time constant

A = Amplitude; %sinusoidal stimulus term (intensity of the dyad inputs)

vinit = 0; %voltage initial condition (starts at 0)

tlast = 0; %initialize last firing times

rads = frequency;

v = vinit;

D = DPass;

I = 0.9; %units of current divided by capacitance (bias to the cells. This gives a kick to the cells as they're reaching threshold voltage.)

a = 1;

b = 1;

RM03input1to1 = zeros(size(0:dt:tfin));

itercount = 1;

%main loop (LIF voltage change is measured, then the noise is added to the previous voltage)

for t=0:dt:tfin

noise = sqrt(2*D*dt)*randn();

dv = -v/tau + I*(1 + A*cos(a*rads*t) + A*cos(b*rads*t));

v = v + dt*dv + noise;

if (v >= vth)

tlast = t;

v = vr;

lif1data = [lif1data; t];

end

if (v >= vth)

RM03input1to1(itercount) = 1;

itercount = itercount + 1;

else

itercount = itercount + 1;

end

end

isi = diff(lif1data); %difference between consecutive spike times

any help on this would be greatly appreciated!

Answer 1

[Sriram Tadavarty]

Hi Olivia,

You can use save and load functions for this purpose.

In the function, use save('RM03Input',RM03input1to1) % first argument is the file name, second argument is the variable name

This will create a mat file with name RM03Input in the working folder.

The variables from this mat file can be accessed from another function by loading the mat file.

function temp
    load('RM03Input.mat')
    i = RM03inpt1to1(1);
end

Here are the documentation links which provide more details about the usage:

https://www.mathworks.com/help/matlab/ref/save.html

https://www.mathworks.com/help/matlab/ref/load.html

https://www.mathworks.com/help/matlab/matlab_env/save-load-and-delete-workspace-variables.html

https://www.mathworks.com/help/matlab/import_export/load-parts-of-variables-from-mat-files.html

Hope this helps.

Regards,

Sriram

[Olivia Ellis]

Yes this worked thank you so much!

[Sriram Tadavarty]

Hi Olivia, Please do accept the answer, if helpful.