Code from mathematica to matlab -- table command

Question

I have the following code from mathematica and trying to do it with matlab but I can't do it:

tX := Sum[Random[] - 0.5, {m}]/m
m=1;
km=10m;
dataX = Table[tX, {km}]
fig2 = ListPlot[dataX, PlotStyle -> {RGBColor[1, 0, 0], PointSize[0.015]}]

I did this :

tx=sum(rand(1,m)-0.5) ./ m;
m=100;
km=100*m;
datax=zeros(tx,1);
for i=1:km
    datax(i,1)=[tx];
end

I have two problems:

In mathematica the tx := means that the variable tx is evaluated each time it is used. How can I accomplish this in matlab?
I have some mistake or mistakes in my code because when it gives me the plot it gives me a straight line but it should give a big number of points.

MarkV MarkV · Accepted Answer · 2011-02-12T18:31:33

I believe this is what you want:

m = 1;
km = 10*m;
tX = @(m) sum( rand(m,1) - 0.5 )/ m;
dataX = arrayfun(tX, m * ones(km,1)); 
plot(1:km, dataX, 'r.')

To generate an instance of tX, just type tX(m), where m is the value you want.

to explain some of this:

tX is a function handle, it is equivalent to tX[m_] := Sum[RandomReal[],{m}]/m in Mathematica.

dataX is constructed with arrayfun which applies the function handle in the first slot to each element in the vector in the second slot. That command is roughly equivalent to Table[tX[m],{km}] in Mathematica.

Code from mathematica to matlab -- table command

1 Answers