random - pulling an excel sheet with =rand(between) in a Python while loop, and exporting results as .dbf -

-

to preface question: new stack overflow, , relatively new python.

i working on setting sensitivity analysis. working 40 parameters range 0.1 - 1. analysis requires simultaneously varying these parameters +-0.1 ~500 times. these values fed arcgis tool. so, need 500 sets of random values, 40 parameters. these parameter values compared output of tool, see parameters model sensitive to. i've set excel sheet randomly calculate these values each time it's opened, issue need in .dbf format read arcgis tool.

i have set while loop (for 10 iterations start, need ~500) , tried 2 different methods, in hopes automate process of calling .xls generate random numbers, , exporting .dbf.

the first, arcpy.copyrows_management correctly exported .dbf. issue output exact same each iteration, , instead of having values of 0.1, 0.2, 0.3 etc, contained values of 0.22, 0.37, 0.68 etc. wasn't tenths, though specified in formulas in .xls.

i tried arcpy.tabletotable_conversion throwing error 999999: error executing function.

i open kinds of suggestions. perhaps there easier way randomly sample , export results .dbf in python. not need done using arcpy, i've worked with. appreciate provided! time.

i = 0 while < 10:     # set run specific variables     lulc = "d:\\saruns\\lulc_nosoils_rand.xls\\lulc_nosoils$"     folder = "d:\\saruns"      print "reading lulc"      newlulc = "d:\\saruns\\lulc_nosoils_rand"+str(i)+".dbf"      print "reading newlulc"      # copy rows copying dbf, values inside      # same each run. and, none correct.         arcpy.copyrows_management(lulc, newlulc)      # table table should work. isn't.         # arcpy.tabletotable_conversion(lulc, folder, newlulc)      print "converting table"         i+= 1

when calculating values in excel decimals. if specify numer format 1 decimal, whole number still there. assume why not "exact numbers" 1 decimal. apply round function 1 decimal only.

copy rows copy values out of dbf, not open excel call formula calculating new random value.

so either have calculate random values in python , create dbase output or need open excel instance - wich shoult trigger new random values - , save excel sheet dbase.

maybe populating arcmap table values using calculatefield_management , exporting data dbase work, i.e. this:

     arcpy.tabletodbase_conversion(tablename, outpath)

Comments

Post a Comment

Popular posts from this blog

css - Which browser returns the correct result for getBoundingClientRect of an SVG element? -

-
this svg contains rect overflows svg element: <svg id='svg' width='10' height='10'> <rect x='-10' y='-10' width='30' height='30'/> </svg> chrome 28 , opera 12 return getboundingclientrect() svg element width , height of 10. firefox 23 reports width , height of 30. correct? jsfiddle the relevant spec cssom , delegates svg spec if svg element not "have associated css layout box". haven't found definition of "having associated css layout box", correct result seem hinge on definition, getbbox returns 30x30 rect in browsers. this firefox bug fixed now, fix in firefox nightlies , should make through firefox 33 released on 14 october 2014. see bug 530985 details.
Read more

gcc - Calling fftR4() in c from assembly -

-
i trying asm fft implementation www.embeddedsignals.com work. running make gives error: undefined reference fftr4(short*, short*, int) at top of asm have .syntax unified .thumb .global fftr4 .type fftr4, %function and there #define's associate c functions arguments registers followed macros fftr4 function uses. after that, fftr4 called .thumb_func fftr4: stmfd sp!, {r4-r11, lr} mov tmp0, #0 // bit reversed counter mov tmp1, #0 .word 0xf3a2fa92 //rbit r3,r2 //rbit r,n lsl r,#3 and c code follows: void fftr4(short *y, short *x, int n); short x[512]; short y[512]; int i; void loop() { (i=0;i<512;i++) x[i]=0; (i=0;i<512;i=i+8) { x[i+0]=16384; x[i+2]=16384; x[i+4]=-16384; x[i+6]=-16384;} fftr4(y, x, 256); serialusb.println(y[128]); serialusb.println(y[129]); serialusb.println(y[384]); serialusb.println(y[385]); // expected results: //y[128]is 8191; y[129] -8190 y[
Read more

Function that returns a formatted array in VBA -

-
i have function prints excel data text file in array format following: [ ['id', 'label', 'longitude', 'latitude', 'country', 'region', 'ttl_wt_flw_thru', 'sum-of-bol-wt', 'count of wdr_ref', 'ratio'], ['aeauh', 'abu dhabi, united arab emirates', 54.3666667, 24.4666667, 'ae', 'eame', 66, 30, 8432, 281.066666666667], ['aedxb', 'dubai, united arab emirates', 55.307485, 25.271139, 'ae', 'eame', 682, 3, 8369, 2789.66666666667] ] my code writing array is: function fillsourcearray() dim long, j long, s string dim lastrow double dim s1 string 'opens file filepath = filepath & "dataarray" & ".txt" open filepath output #1 'read source data dataarray = sheets("nodes").cells(1).currentregion.value 'determine lastrow lastrow = sheets("nodes").range
Read more