how can i create a 3d-plot from a matrix?
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Hi guys, i trying to create a 3d-plot or a waterfall-plot from an excel-table but i cant do it.
Maybe y could help me!.
The problem is that i have 3 variables: Time, frequency and soundpressure (SPL) y can take a look into the attachment.
could y tell me how to make it?
i thank y a lot!
Regards
Nico.
2 个评论
Walter Roberson
2019-5-7
You have 13 header lines.
Your 14th header line starts with 'Hz' and has a number of values listed after that without indication of meaning. Are those times?
Line 15 to 45 appears to start with a frequency and have a number of readings after that. Are those SPL corresponding to the times from line 14 ?
You have semi-colon delimited values with comma as the decimal separator.
It appears that at higher frequencies you have fewer entries per line.
Nicolas Ippoliti
2019-5-7
采纳的回答
Walter Roberson
2019-5-8
0 个投票
I have attached code.
The data was messier than it looked. There were two half-tables side by side, same times and same frequencies, but with ranges that are somewhat different. The code plots them in different plots, variables SPL1 and SPL2 .
You might want to set YScale to log for the plots, since the frequences increase on a log scale (looks like 10*log10(4) as the exponent)
For the first plot, it is meaningful to set the Z scale to log, as all of the values are positive except for one 0.
For the second plot, there are a number of negative values, so it does not make sense to use log scale.
The top left point in the right hand set of data comes across as exactly 65535 . I was pretty sure that was an indicator of invalid data, so I set that to nan.
2 个评论
Nicolas Ippoliti
2019-5-8
Walter Roberson
2019-5-8
I am not sure what a terz frequency distribution is, or an octave for this purpose? Do you want the frequency axes to be labeled with log2 of the frequency?
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