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Student Support Forum: 'SetDelayed::write error' topicStudent Support Forum > General > Archives > "SetDelayed::write error"

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Sandra Ugrina
03/24/09 12:43pm

Dear Mathematica users,

I am new to Mathematica and I am trying to start off with a simple example. I am trying to evaluate lux below over a range of k (k=[0.01:10].

lux[k_] := (k Coth[2 k] + 2 k^2 Csch[2 k]^2 - 1)/(2 k^4)

However, I am getting a following error:
SetDelayed::write: "Tag Times in ((-1+k\Coth[2\k]+2\k^2\Csch[2 \
k]^2)/(2\k^4))[k_] is Protected. "

I was able to plot the above function of k when expressed as:

lux= (k Coth[2 k] + 2 k^2 Csch[2 k]^2 - 1)/(2 k^4)

Plot[lux,k,{0.01,10}]

How do I get the actual values of lux. It looks like a silly problem yet I can't get it to work. Any is appreciated!

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Subject (listing for 'SetDelayed::write error')
Author Date Posted
SetDelayed::write error Sandra Ugrina 03/24/09 12:43pm
Re: SetDelayed::write error Tom 03/30/09 5:20pm
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